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Sipdroid - Free and open-source SIP/VoIP Client
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Dingtone - Dingtone is a free call and texting application for making unlimited calls and text messages to any number at the moment registered in any part of the world by any cellular company.
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.