# AI phone & voice agents tools used by Technology & Connectivity companies usedby lists 15 Technology & Connectivity companies using 6 AI phone & voice agents tools. The most used is Synthflow: 4 of the 15 Technology & Connectivity companies on usedby, every proof level counted. These are counts of the companies usedby tracks, not a market share. Data as of 2026-10-24. ## Largest and best-proven users Two labelled views of the same companies. Neither is a score. ### Largest companies By employee range. Size known for 9 of 15. | Company | Proof | Employees | Tools | Last check | |---|---|---|---|---| | [Atos](https://www.usedby.ai/companies/atos.md) | Confirmed | 10,001+ | PolyAI | 2026-10-21 | | [TaskUs](https://www.usedby.ai/companies/taskus.md) | Observed | 10,001+ | Regal | 2026-10-24 | | [Lenovo](https://www.usedby.ai/companies/lenovo.md) | Observed | 10,001+ | Retell AI | 2026-10-20 | ### Strongest proof Confirmed or declared: 10 of 15. This view filters what you read, never what is counted. | Company | Proof | Employees | Tools | Last check | |---|---|---|---|---| | [Amazon Ring](https://www.usedby.ai/companies/amazon-ring.md) | Confirmed | Unknown | Vapi | 2026-10-22 | | [Fleetworks](https://www.usedby.ai/companies/fleetworks.md) | Confirmed | Unknown | Vapi | 2026-10-22 | | [Unity AI](https://www.usedby.ai/companies/unity-ai.md) | Confirmed | Unknown | Vapi | 2026-10-22 | ## Ranking Tools ranked by the companies of the 15 Technology & Connectivity companies on usedby that use them. Each company counts once per tool, at its strongest proof. Ties go to more confirmed, then declared, then observed companies. | # | Tool | Companies | Confirmed | Declared | Observed | Job posts only | Last check | |---|---|---|---|---|---|---|---| | 1 | [Synthflow](https://www.usedby.ai/tools/synthflow.md) | 4 | 2 | 0 | 2 | 0 | 2026-10-16 | | 2 | [Bland AI](https://www.usedby.ai/tools/bland-ai.md) | 3 | 3 | 0 | 0 | 0 | 2026-10-20 | | 3 | [Vapi](https://www.usedby.ai/tools/vapi.md) | 3 | 3 | 0 | 0 | 0 | 2026-10-22 | | 4 | [Retell AI](https://www.usedby.ai/tools/retell-ai.md) | 3 | 1 | 0 | 2 | 0 | 2026-10-20 | | 5 | [PolyAI](https://www.usedby.ai/tools/polyai.md) | 1 | 1 | 0 | 0 | 0 | 2026-10-21 | | 6 | [Regal](https://www.usedby.ai/tools/regal.md) | 1 | 0 | 0 | 1 | 0 | 2026-10-24 | ## Customers per tool Every line is a customer, at one of three proof levels: confirmed (a case study, a named quote, a press release, or the company's own public account of using the tool (its own site, or a post by one of its executives, VP or above)), observed (the vendor shows the company on its own pages) or signal (a job post shows the company's employees use the tool, the weakest proof). A line the company declared to usedby itself, or that it lists as a sub-processor on its own legal page, is marked declared. A signal is never a case study or a vendor listing. Strongest proof first. "Last check" is the later of the line's re-verification and its latest capture. | Tool | Company | Proof | Source | Last check | |---|---|---|---|---| | Synthflow | [Aizee](https://www.usedby.ai/companies/aizee.md) | Confirmed | [synthflow.ai](https://synthflow.ai/customer-stories/freshworks-x-synthflow), captured 2026-10-13 | 2026-10-16 | | Synthflow | [Smartcat](https://www.usedby.ai/companies/smartcat.md) | Confirmed | [synthflow.ai](https://synthflow.ai/customer-stories/freshworks-x-synthflow), captured 2026-10-13 | 2026-10-16 | | Synthflow | [Altamira](https://www.usedby.ai/companies/altamira.md) | Observed | [synthflow.ai](https://synthflow.ai/pricing), captured 2026-10-16 | 2026-10-16 | | Synthflow | [Hostinger](https://www.usedby.ai/companies/hostinger.md) | Observed | [synthflow.ai](https://synthflow.ai/pricing), captured 2026-10-16 | 2026-10-16 | | Bland AI | [Needle](https://www.usedby.ai/companies/needle.md) | Confirmed | [bland.ai](https://www.bland.ai/customers/needle), captured 2026-10-04 | 2026-10-20 | | Bland AI | [Slash](https://www.usedby.ai/companies/slash.md) | Confirmed | [bland.ai](https://www.bland.ai/customers/ihfa), captured 2026-10-10 | 2026-10-20 | | Bland AI | [PrecisionIT](https://www.usedby.ai/companies/precisionit.md) | Confirmed | [bland.ai](https://www.bland.ai/customers/precisionit), captured 2026-10-10 | 2026-10-20 | | Vapi | [Amazon Ring](https://www.usedby.ai/companies/amazon-ring.md) | Confirmed | [vapi.ai](https://vapi.ai/customers/amazon-ring), captured 2026-10-08 | 2026-10-22 | | Vapi | [Fleetworks](https://www.usedby.ai/companies/fleetworks.md) | Confirmed | [vapi.ai](https://vapi.ai/customers/fleetworks), captured 2026-10-08 | 2026-10-22 | | Vapi | [Unity AI](https://www.usedby.ai/companies/unity-ai.md) | Confirmed | [vapi.ai](https://vapi.ai/customers/unity-ai), captured 2026-10-08 | 2026-10-22 | | Retell AI | [Everise](https://www.usedby.ai/companies/everise.md) | Confirmed | [retellai.com](https://www.retellai.com/case-study/how-everise-contained-65-of-internal-service-desk-tickets-with-retell-ai), captured 2026-10-09 | 2026-10-20 | | Retell AI | [Lenovo](https://www.usedby.ai/companies/lenovo.md) | Observed | [retellai.com](https://www.retellai.com/customers), captured 2026-10-20 | 2026-10-20 | | Retell AI | [Motorola](https://www.usedby.ai/companies/motorola.md) | Observed | [retellai.com](https://www.retellai.com/customers), captured 2026-10-20 | 2026-10-20 | | PolyAI | [Atos](https://www.usedby.ai/companies/atos.md) | Confirmed | [poly.ai](https://poly.ai/customers/atos), captured 2026-10-08 | 2026-10-21 | | Regal | [TaskUs](https://www.usedby.ai/companies/taskus.md) | Observed | [regal.ai](https://www.regal.ai/), captured 2026-10-24 | 2026-10-24 | ## Method Public customer lines of active AI phone & voice agents tools at companies classified in Technology & Connectivity. No software vendor had to be left out. Company mix by strongest proof: 10 confirmed, 0 declared, 5 observed and 0 signals. ## Questions ### Which AI phone & voice agents tools do Technology & Connectivity companies use most? Synthflow leads: 4 of the 15 Technology & Connectivity companies on usedby that use AI phone & voice agents tools use it. Next: Bland AI (3), Vapi (3), Retell AI (3), and PolyAI (1). ### How many Technology & Connectivity companies use AI phone & voice agents tools? 15 Technology & Connectivity companies on usedby use at least one of 6 AI phone & voice agents tools. It counts the companies usedby tracks. ### What proof backs these lines? Of the 15 companies, each counted at its strongest proof: 10 confirmed, 0 declared, 5 observed and 0 known from a job post. ### How does usedby build this ranking? usedby counts each Technology & Connectivity company once per tool, from public proof: case studies, press releases, the company's own site or its declaration to usedby, vendor customer pages and job posts. Every line shows its proof and the date usedby last checked it. Industry page: https://www.usedby.ai/companies/industry/technology-connectivity.md · Category page: https://www.usedby.ai/tools/category/ai-phone-agents.md --- Source: https://www.usedby.ai/companies/industry/technology-connectivity/ai-phone-agents · How we check: https://www.usedby.ai/methodology