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#2 WhatsApp
End‑to‑end encrypted voice and video calls, group calls up to 8 participants, and seamless integration with contacts.
#3 Telegram
Secure messaging platform with free voice and video calls, group calls for up to 1,000 members, and cloud‑based media storage.
#4 Signal
Privacy‑focused app offering encrypted voice/video calls, disappearing messages, and open‑source security audits.
Mass‑market messenger with free voice/video calls, group calls, AR effects, and integration with Facebook contacts.
#6 Skype
Classic VoIP service from Microsoft, supporting free voice/video calls, screen sharing, and up to 100 participants in group calls.
#7 Google Meet
Google’s video‑conferencing app (formerly Duo) offering free high‑definition voice/video calls and up to 100 participants.
#8 Google Voice
Free U.S. phone number with unlimited domestic calls, voicemail transcription, and integration with Google Contacts.
#9 Viber
Cross‑platform messenger with free voice/video calls, group chats, stickers, and end‑to‑end encryption.
#10 Line
Popular in Asia, offering free voice/video calls, large group chats, timeline sharing, and a rich sticker ecosystem.
#11 WeChat
All‑in‑one app for messaging, voice/video calls, social feed, and mobile payments, widely used in China.
#12 Discord
Gaming‑oriented platform with free voice channels, video calls, screen share, and community servers.
Free tier allows unlimited 1‑on‑1 calls and 40‑minute group meetings with HD video and screen sharing.
#14 Jitsi Meet
Open‑source, no‑account‑required video conferencing with end‑to‑end encryption and unlimited participants.
#15 IMO
Lightweight app for free voice/video calls, group chats, and file sharing, optimized for low‑bandwidth networks.
#16 Talkatone
Provides a free U.S. phone number for voice calls and texting over Wi‑Fi or cellular data.
#17 TextNow
Free ad‑supported phone number with unlimited domestic calls and SMS, plus VoIP calling over data.
#18 Dingtone
Free VoIP service offering a secondary phone number, voice/video calls, and group chat features.
#19 2Talk
Free calling app that assigns a U.S. or Canadian number for voice calls and texting without a SIM.
#20 KakaoTalk
South Korean messenger with free voice/video calls, group chats, and integrated mobile payments.
#21 Zalo
Vietnam‑focused messaging app offering free voice/video calls, stickers, and social feed features.
#22 Microsoft Teams
Collaboration hub with free voice/video meetings, screen sharing, and up to 100 participants per meeting.
#23 RingCentral
Free tier provides unlimited domestic voice calls, video meetings, and team messaging for small groups.
#24 Zoiper
Free SIP softphone supporting multiple VoIP providers, HD voice, and push‑to‑talk functionality.
#25 Linphone
Open‑source SIP client with voice/video calls, encryption, and support for custom VoIP servers.
#26 Grandstream Wave
Free SIP client for Android/iOS, offering HD voice, video calls, and integration with Grandstream PBX systems.
#27 3CX Phone
Mobile companion to the 3CX PBX, providing free SIP calling, video calls, and presence status.
#28 Tox
Decentralized, peer‑to‑peer messenger with encrypted voice/video calls and no central servers.
#29 Wire
Secure collaboration app offering end‑to‑end encrypted voice/video calls, file sharing, and team chats.
#30 Briar
Privacy‑first messenger that works over Bluetooth, Wi‑Fi, or Tor, providing encrypted voice calls without central servers.
#31 Mumble
Low‑latency, open‑source voice chat primarily for gamers, supporting encrypted communication and custom servers.
Matrix‑based messenger with free encrypted voice/video calls, bridging to other platforms, and self‑hosting options.
#33 Voxox
Free VoIP app that provides a U.S. phone number, unlimited calls to the U.S./Canada, and SMS capabilities.