61/100IFR Score
Ranked #1 because of its Google rating and service focus: 4.9★ from 78 Google reviews, listed on Google as “Telecommunications service provider”.
Best Business Phone System Providers in Foster City, CA (2026)
137 business phone system providers ranked by IFR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Foster City: Total Wireless, IFR Score 61/100; 4.9★ from 78 Google reviews; open 7 days a week.
- 35
Most-reviewed: RingCentral, 1,714 Google reviews at 3.8★, the most of 137 ranked; ranked #35.
Rankings can't be bought. IT providers can't pay to change their rank or score. How we rank
137 Foster City business phone system providers are ranked here by IFR Score, from nine published factors. 74 open Saturdays and 66 open Sundays, based on posted hours. The median Google rating is 4.8★ across 137 rated IT firms.
Top 10 business phone system providers in Foster City at a glance
Ranked by IFR Score from public data. Sponsored placements are labelled and never change the order.
| Rank | Business | IFR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Total Wireless | 61 | 4.9★ (78) | San Francisco, 16 mi away | Sat · Sun · Evenings | Overall |
| 2 | ringfusion | 59 | 5.0★ (34) | San Francisco, 18 mi away | Sat · Sun · Evenings | — |
| 3 | Access Cabling | 59 | 5.0★ (14) | San Mateo, 1 mi away | Sat · Sun · Evenings | — |
| 4 | Enterprise Communications | 58 | 4.8★ (21) | Berkeley, 5 mi away | Sat · Sun | — |
| 5 | Zencom Cabling Solutions Inc | 57 | 4.8★ (32) | Fremont, 21 mi away | Sat · Sun | — |
| 6 | PLATINUM WIRELESS & REPAIR | 57 | 4.8★ (516) | San Francisco, 14 mi away | Sat · Sun · Evenings | — |
| 7 | Total Wireless | 56 | 4.7★ (79) | Fairfield, 49 mi away | Sat · Sun · Evenings | — |
| 8 | Total Wireless | 56 | 5.0★ (40) | Pittsburg, 38 mi away | Sat · Sun · Evenings | — |
| 9 | Race Communications | 56 | 4.0★ (118) | South San Francisco, 10 mi away | — | — |
| 10 | PanTerra Networks Inc | 56 | 4.0★ (19) | San Jose, 24 mi away | Sat · Sun · Evenings | — |
The 137 best business phone system providers in Foster City, ranked
Ordered by IFR Score, a 0–100 score from nine published factors. Paid placement never changes the order.
Ranked by IFR Score from public data. Sponsored placements are labelled and never change the order.
Scores below: based on 8 of 9 factors; recency not yet collected. Hatched segments mark factors we don't have yet.
#2 ringfusion
Based in San Francisco, 18 mi away
59/100IFR ScoreRanked #2 because of its Google rating and service focus: 5.0★ from 34 Google reviews, listed on Google as “Telecommunications service provider”.
Based in San Mateo, 1 mi away
59/100IFR ScoreRanked #3 because of its Google rating and service focus: 5.0★ from 14 Google reviews, listed on Google as “Telecommunications contractor”.
Based in Berkeley, 5 mi away
58/100IFR ScoreRanked #4 because of its Google rating and service focus: 4.8★ from 21 Google reviews, listed on Google as “Telecommunications contractor”.
Based in Fremont, 21 mi away
57/100IFR ScoreRanked #5 because of its Google rating and service focus: 4.8★ from 32 Google reviews, listed on Google as “Telecommunications contractor”.
Based in San Francisco, 14 mi away
57/100IFR ScoreRanked #6 because of its Google rating and review volume: 4.8★ from 516 Google reviews.
Based in Fairfield, 49 mi away
56/100IFR ScoreRanked #7 because of its Google rating and service focus: 4.7★ from 79 Google reviews, listed on Google as “Telecommunications service provider”.
Based in Pittsburg, 38 mi away
56/100IFR ScoreRanked #8 because of its Google rating and service focus: 5.0★ from 40 Google reviews, listed on Google as “Telecommunications service provider”.
Based in South San Francisco, 10 mi away
56/100IFR ScoreRanked #9 because of its Google rating and service focus: 4.0★ from 118 Google reviews, listed on Google as “Telecommunications service provider”.
Based in San Jose, 24 mi away
56/100IFR ScoreRanked #10 because of its Google rating and service focus: 4.0★ from 19 Google reviews, listed on Google as “Telecommunications service provider”.
#11 Riser Telecom
Based in Fremont, 16 mi away
55/100IFR ScoreRanked #11 because of its Google rating and service focus: 5.0★ from 7 Google reviews, listed on Google as “Telecommunications contractor”.
Based in Santa Clara, 21 mi away
55/100IFR ScoreRanked #12 because of its Google rating and service focus: 4.3★ from 11 Google reviews, listed on Google as “Telecommunications service provider”.
Based in San Mateo, 2 mi away
55/100IFR ScoreRanked #13 because of its Google rating and review volume: 4.5★ from 609 Google reviews.
#14 City Cabling
Based in San Francisco, 18 mi away
55/100IFR ScoreRanked #14 because of its Google rating and service focus: 5.0★ from 6 Google reviews, listed on Google as “Telecommunications contractor”.
Based in Berkeley, 22 mi away
55/100IFR ScoreRanked #15 because of its Google rating and review volume: 4.8★ from 290 Google reviews.
Based in Milpitas, 22 mi away
55/100IFR ScoreRanked #16 because of its Google rating and service focus: 4.5★ from 8 Google reviews, listed on Google as “Telecommunications service provider”.
Based in San Francisco, 18 mi away
55/100IFR ScoreRanked #17 because of its Google rating and service focus: 3.9★ from 18 Google reviews, listed on Google as “Telecommunications service provider”.
Based in Castro Valley, 14 mi away
55/100IFR ScoreRanked #18 because of its Google rating and review volume: 4.9★ from 171 Google reviews.
#19 LANgineers
Based in Burlingame, 6 mi away
55/100IFR ScoreRanked #19 because of its Google rating and service focus: 4.3★ from 34 Google reviews, listed on Google as “Telecommunications service provider”.
#20 Total Wireless
Based in San Leandro, 12 mi away
54/100IFR ScoreRanked #20 because of its Google rating and service focus: 4.0★ from 10 Google reviews, listed on Google as “Telecommunications service provider”.
Based in Pleasanton, 23 mi away
54/100IFR ScoreRanked #21 because of its Google rating and review volume: 4.8★ from 261 Google reviews.
#22 Total Wireless
Based in San Francisco, 16 mi away
54/100IFR ScoreRanked #22 because of its Google rating and service focus: 4.5★ from 8 Google reviews, listed on Google as “Telecommunications service provider”.
Based in San Francisco, 13 mi away
54/100IFR ScoreRanked #23 because of its Google rating and service focus: 3.5★ from 4 Google reviews, listed on Google as “Telecommunications service provider”.
Based in San Jose, 26 mi away
53/100IFR ScoreRanked #24 because of its Google rating and service focus: 3.9★ from 7 Google reviews, listed on Google as “Telecommunications service provider”.
#25 MightyCall
Based in San Francisco, 18 mi away
53/100IFR ScoreRanked #25 because of its Google rating and service focus: 2.9★ from 48 Google reviews, listed on Google as “Telecommunications service provider”.
Business phone system providers ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in IFR Score order; each links to its profile. We publish the top 50 of 137 ranked business phone system providers here; the rest are on their profiles.
| Rank | Business | IFR Score | Google rating | Distance |
|---|---|---|---|---|
| 26 | Hubsyde | 53 | 5.0★ (4) | 10 mi |
| 27 | Fastmetrics LLC - Business ISP / MSP | 53 | 4.6★ (22) | 17 mi |
| 28 | Cabling Inc | 53 | 5.0★ (3) | 19 mi |
| 29 | Total Wireless | 53 | 4.8★ (121) | 16 mi |
| 30 | Total Wireless | 53 | 4.2★ (5) | 14 mi |
| 31 | Phone Repair Crystal Wireless | Yes, iCan Fix | 53 | 4.8★ (229) | 31 mi |
| 32 | 8x8, Inc. | 53 | 3.4★ (288) | 26 mi |
| 33 | PAXIO | 53 | 4.8★ (418) | 20 mi |
| 34 | Cable Shmable | 52 | 5.0★ (97) | 10 mi |
| 35 | RingCentral | 52 | 3.8★ (1,714) | 4 mi |
| 36 | Total Wireless | 52 | 3.5★ (4) | 15 mi |
| 37 | Starz Telecom, Inc | 52 | 3.3★ (3) | 23 mi |
| 38 | LC Networks | 52 | 4.6★ (21) | 24 mi |
| 39 | Mobile Services | 52 | 1.1★ (11) | 8 mi |
| 40 | Wiztec LLC | 52 | 5.0★ (45) | 5 mi |
| 41 | Td Communications | 52 | 5.0★ (6) | 3 mi |
| 42 | Overlook Networks | 52 | 5.0★ (5) | 28 mi |
| 43 | I-Step Communications | 52 | 4.7★ (3) | 17 mi |
| 44 | CloudFast | 52 | 5.0★ (4) | 24 mi |
| 45 | Etheric Networks, Inc. | 52 | 4.2★ (61) | 6 mi |
| 46 | SpiderCloud Wireless | 52 | 5.0★ (6) | 21 mi |
| 47 | Atlas Voice & Data | 52 | 5.0★ (9) | 15 mi |
| 48 | INFORTECH CORPORATION | 52 | 4.4★ (15) | 21 mi |
| 49 | XO Communications | 52 | 3.5★ (30) | 17 mi |
| 50 | Dimension Data Cloud Business Unit Offices | 52 | 4.5★ (6) | 19 mi |
Also serving Foster City
20 more business phone system providers within 50 mi that we can't rank yet: too few reviews, or a service we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| All Covered | 5.0★ (2) | In Foster City |
| Avid Communications | 3.0★ (2) | 18 mi |
| Call Tools | 5.0★ (2) | 18 mi |
| Clickatell | 5.0★ (2) | 3 mi |
| Communications Install Solutions, Inc. | 5.0★ (2) | 4 mi |
| Crystal Communications | 5.0★ (2) | 11 mi |
| Exabeam, Inc | 4.6★ (20) | In Foster City |
| Fiber Internet Center | 5.0★ (2) | 12 mi |
| Fremont Network Cabling & Security | 5.0★ (2) | 14 mi |
| IT Total Care | 4.9★ (96) | In Foster City |
| Konica Minolta Business Solutions | 1.0★ (1) | In Foster City |
| Mitel | 5.0★ (2) | 19 mi |
| Pacific Bell Telephone Company | 4.0★ (2) | 18 mi |
| Singapore Telecom USA | 4.0★ (2) | 6 mi |
| Telecom Networking Systems Inc | 1.5★ (2) | 19 mi |
| UnitedLayer | 5.0★ (2) | 13 mi |
| vUnity Business Internet | 3.0★ (2) | 17 mi |
| Wands & Hammers | 5.0★ (2) | 18 mi |
| XICOMM | 5.0★ (2) | 18 mi |
| Xtelesis Corporation | 5.0★ (2) | 5 mi |
How we ranked Foster City business phone system providers
We scored 137 Foster City business phone system providers on nine factors, weighted as shown. An IT firm is ranked when its service is confirmed and it has 3 or more Google reviews or a claimed profile. An IT firm with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed November 9, 2026.
Paid placement never changes a rank or score. Sponsored businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Foster City data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Review volume | 15% | Number of Google reviews, compared with the most-reviewed IT firm on the list | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday and 24/7 support | Measured |
| Service focus | 15% | How clearly the firm does this service (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The firm has claimed its IT Firms Ranked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The firm links to IT Firms Ranked from its own website with our badge, checked periodically | Measured |
| Client reviews | 10% | Verified client reviews collected by IT Firms Ranked: their rating and how many there are | Measured |
How to choose a business phone system provider
- Ask whether the system is cloud-hosted or installed on site, and who maintains it.
- Check internet capacity and backup: a cloud phone system stops when your connection does.
- Ask how 911 locations are registered for each phone and for remote staff.
- Compare per-user prices on the same features (call recording, queues, integrations).
- Ask for two or three references from clients of your size and industry, and call them.
- Get the scope, response times and price in writing before you sign, including how you leave and get your data back.
Questions to ask a business phone system provider
- Is the price per user, and which features are extra?
- Will you port our existing numbers, and how long does it take?
- What happens to calls if our internet connection goes down?
- How are 911 locations set up for office and remote staff?
- Who do we call for support, and during which hours?
- What is the contract length, and are phones bought or leased?
Terms explained
- MSP (managed service provider)
- A firm that runs a business’s IT for a recurring fee: monitoring, patching, help desk, backups and security tools.
- Co-managed IT
- An arrangement where an outside firm supports an in-house IT person or team, sharing tools and tasks.
- Break-fix
- IT support paid per incident or per hour, with no monthly agreement.
- SLA (service-level agreement)
- The contract terms for response and resolution times, uptime and support hours.
- Help desk
- The support line staff call or email for IT problems.
- RMM
- Remote monitoring and management software that lets an IT firm watch, patch and fix computers remotely.
- vCIO
- A virtual chief information officer: part-time IT strategy and budgeting from an outside firm.
- MSSP
- A managed security service provider: a firm that monitors and manages security tools around the clock.
- EDR / MDR
- Endpoint detection and response software, and the managed service of people watching its alerts (managed detection and response).
- MFA
- Multi-factor authentication: a second proof of identity, such as an app prompt, on top of a password.
- Penetration test
- An authorised, simulated attack on your systems to find weaknesses before criminals do.
- SOC 2
- An independent auditor’s report (AICPA standard) on a service provider’s security controls.
Business phone system providers in Foster City: frequently asked questions
Who is the best business phone system provider in Foster City?
By IFR Score, the highest-ranked business phone system provider in Foster City, CA is Total Wireless with an IFR Score of 61/100. It has 4.9★ from 78 Google reviews. It is open 7 days a week. ringfusion (#2) and Access Cabling (#3) follow. We ranked 137 business phone system providers on nine factors, last updated November 9, 2026.
How many business phone system providers are there in Foster City?
ITFirmsRanked ranks 137 business phone system providers serving Foster City, CA. Another 20 within 50 mi are listed but not ranked yet. Counts are as of November 2026.
Which business phone system providers in Foster City work on weekends?
74 of 137 ranked business phone system providers post Saturday hours and 66 post Sunday hours. The highest-ranked open Saturdays are Total Wireless (#1), ringfusion (#2) and Access Cabling (#3). Posted hours are office hours; many firms also run an after-hours support line for contract clients.
What Google rating do Foster City business phone system providers have?
The median Google rating among 137 rated business phone system providers in Foster City is 4.8★, with a median of 9 reviews. RingCentral has the most, 1,714 reviews, and ranks #35. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ITFirmsRanked rank business phone system providers?
Each business phone system provider gets a 0–100 IFR Score from nine published factors, led by reputation (25%), review volume (15%), service focus (15%) and recency (10%). An IT firm with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only IT firms with a confirmed service and 3 or more reviews, or a claimed profile, are ranked.
Do business phone system providers outside Foster City count in this ranking?
Yes, if they are within 50 mi of the Foster City city center, our service radius for business phone system providers. Each listing shows where the IT firm is based and how far away it is. Proximity is 5% of the IFR Score, so a nearby IT firm gets a small edge.
Can business phone system providers pay to rank higher on ITFirmsRanked?
No. The IFR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured IT firms may appear above the list, labelled Sponsored and showing their honest rank.
What does a business phone system provider do?
Business phone system providers set up and support office phone systems, mostly cloud VoIP today: numbers, desk phones, call routing, voicemail and contact-centre features.
How are business phone system providers in Foster City ranked?
By IFR Score: Google rating and review volume, recent reviews, opening hours, how clearly the firm does business phone systems and VoIP, distance, a claimed profile, our badge and verified client reviews. Sponsored placements never change the order.
Can we keep our phone numbers if we switch providers?
In most cases yes: numbers can be ported to a new provider in the US and Canada. Keep your current service active until the port is complete, and ask the new provider to manage the port request.
What about 911 calls on a VoIP system?
Each phone needs a registered location so 911 calls go to the right place. In the US, multi-line systems must support direct 911 dialling and send dispatchable location information under federal rules (Kari’s Law and RAY BAUM’S Act). Ask the provider how they set this up.
Update log for Foster City
- November 2026: IFR Scores recalculated for 137 business phone system providers serving Foster City.
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