Y Combinator

Founded in 2005, Y Combinator is a California-based startup accelerator and early-stage venture capital firm. It provides funding, mentorship, and resources to early-stage companies across various industries, with a focus on technology, healthcare, and finance. The organization helps founders refine their business models and products through an intensive three-month program in Silicon Valley, culminating in Demo Day presentations to investors.

Gustaf Alströmer

Partner

Tim Brady

Partner

Dalton Caldwell

Managing Director

Adora Cheung

Partner

Nic Dardenne

Principal

Nicolas Dessaigne

Partner

Aaron Epstein

Group Partner

Brad Flora

Partner

Jared Friedman

Partner

Anu Hariharan

Partner

Diana Hu

Partner

Reshma Khilnani

Partner

Pete Koomen

Visiting Group Partner

Carolynn Levy

Partner

Jon Levy

Managing Director

David Lieb

Partner

Jessica Livingston

Partner

Simon Lu

Principal

Kat Manalac

Managing Partner

Eric Migicovsky

Partner

Kirsty Nathoo

Partner

Geoff Ralston

President

Ali Rowghani

Managing Partner

Surbhi Sarna

Partner

Michael Seibel

Managing Director

Harj Taggar

Group Partner

Garry Tan

President

Matt Bogrand

Senior Associate

Past deals in VoIP

voize

Seed Round in 2025
Voize is a company that specializes in developing a digital voice assistant designed specifically for senior care documentation. Its software facilitates the creation of structured documentation entries by utilizing voice input and text analysis, which allows for seamless integration into existing systems. This innovative approach enables caregivers and nursing staff to significantly reduce the time spent on documentation tasks, thereby allowing them to focus more on providing actual care to the elderly. Additionally, Voize offers maintenance tests and inspection solutions, further enhancing its service offerings in the senior care sector.

Leaping AI

Pre Seed Round in 2025
Leaping AI specializes in creating AI-powered voice agents that mimic human conversation to automate and streamline call center operations for businesses. Their platform, powered by generative AI, handles various tasks like complex workflows, sales, customer support, and outbound campaigns across multiple channels. This enables companies to scale their customer service, reduce costs, and monitor call quality through dashboards and transcripts.

Terrakotta

Pre Seed Round in 2024
Terrakotta develops a technical interview platform that employs AI to guide candidates through coding challenges, providing recruiters with efficient insights into candidate skills.

Shiboleth

Pre Seed Round in 2024
Shiboleth automates back-office quality assurance and compliance processes in consumer lending.

Avoca

Pre Seed Round in 2023
Avoca develops a client communication platform that enables business owners to focus on their core skills by providing AI-driven reception services for inbound and outbound communications.

Devyce

Venture Round in 2022
Devyce is a London-based company established in 2020 that specializes in developing a cloud-based virtual phone system utilizing voice over internet protocol (VoIP) technology. The company’s operating system is designed to offer businesses a flexible, scalable, and reliable communication solution that enhances enterprise collaboration. By transforming voice into digital signals transmitted over the internet, Devyce enables users to make and receive calls on various devices, including desktops and smartphones. The system also incorporates essential features such as voicemail, call forwarding, and conference calling, allowing businesses to efficiently maintain communication with employees, customers, and clients while meeting their communication needs.

voize

Pre Seed Round in 2022
Voize is a company that specializes in developing a digital voice assistant designed specifically for senior care documentation. Its software facilitates the creation of structured documentation entries by utilizing voice input and text analysis, which allows for seamless integration into existing systems. This innovative approach enables caregivers and nursing staff to significantly reduce the time spent on documentation tasks, thereby allowing them to focus more on providing actual care to the elderly. Additionally, Voize offers maintenance tests and inspection solutions, further enhancing its service offerings in the senior care sector.

Community Phone

Pre Seed Round in 2019
Community Phone provides reliable landline phone service for homes and businesses without requiring internet connectivity. It operates during power outages using a device that connects to local cell towers. The company offers unlimited local and long-distance calls within the US, along with features like number transfer, call forwarding, multi-phone ringing, custom dial menus, and voicemail-to-email transcription. They pride themselves on transparent pricing, no hidden fees, and accessible customer support.

Community Phone

Pre Seed Round in 2019
Community Phone provides reliable landline phone service for homes and businesses without requiring internet connectivity. It operates during power outages using a device that connects to local cell towers. The company offers unlimited local and long-distance calls within the US, along with features like number transfer, call forwarding, multi-phone ringing, custom dial menus, and voicemail-to-email transcription. They pride themselves on transparent pricing, no hidden fees, and accessible customer support.

wifi.com.ng

Seed Round in 2017
TIZETI (wifi.com.ng) has been deploying high speed internet access to estates, offices, multi-tenant building using next generation wi-Fi technology. They deploy unlimited internet to residential and business customers which allow customers get the full benefit of the internet with no data or time caps. They also offer VOIP and Video on Demand services.

Squire Technologies

Seed Round in 2016
Squire Technologies is a UK-based company established in 2001 that specializes in signaling product solutions for the telecommunications industry. The company focuses on VoLTE/IMS, NGN VoIP, and SS7 markets, offering both standalone black box products and comprehensive end-to-end solutions through its Next Generation Service. Squire Technologies serves a diverse global customer base, with deployments in over 90 countries, including fixed and mobile operators, MVNOs, ITSPs, wholesale carriers, equipment vendors, integrators, and solution providers. By combining proven network technologies with innovative interface solutions, Squire Technologies addresses the communication challenges faced by tier 1 and tier 2 providers in the rapidly evolving telecom landscape.

Awesometalk

Seed Round in 2014
Awesometalk is a developer of a free video calling application that provides users with cross-platform capabilities for seamless communication. The software is designed to facilitate both group meetings and one-to-one chats, allowing individuals and teams to connect effortlessly without the complexities often associated with online communication tools. By focusing on user-friendly features, Awesometalk aims to enhance the convenience and accessibility of video calling for a diverse range of users.

Voicegem

Seed Round in 2012
Voicegem is a web and iOS app offering an easy way to send voice messages to anyone. Users of Voicegem are provided with the facility to record long messages, and send it to anyone through an email or Facebook message. The recipients (friends or family) of the Voicegem messages can listen and reply to voice messages without installing or signing up with any platform.

SendHub

Seed Round in 2012
SendHub is a cloud-based communications platform that offers a phone system tailored for the mobile world, eliminating the need for hardware and providing instant setup. Users can obtain a local or toll-free phone number in any area code and use it across various devices, including web browsers, iPhones, Androids, feature phones, and through an API. The service allows businesses to add lines for their entire team at no additional cost, offering transparency and detailed analytics on telecommunication activities. Key features include auto attendant, call transfer, company directory, contact sharing, voicemail transcription, text marketing, group texting, and free internal communication tools.

Pingm

Seed Round in 2011
The Phone System for Sales Teams.

TellFi

Seed Round in 2011
Fastest, easiest way to setup a phone system for your business. We take something that has traditionally been painful and expensive, and make it available to everyone. The easiest way to set up a phone system for your business. All the features you want in a business phone system – including extensions, forwarding & voicemail – online for as little as $10 a month.
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