The best alternatives to TalkNow Voice Calling are Lingvanex, WhatsApp, and Roll Call. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
WhatsApp Messenger is a FREE messaging app available for iPhone, Android, and other smartphones. WhatsApp uses your phone's Internet connection (4G/3G/2G/EDGE or Wi-Fi, as available) to let you message and call friends and family. Switch from SMS to WhatsApp to send and receive messages, calls, photos, videos, documents, and Voice Messages.
Finally smart numbers for smartphones. With TextMe Up, your phone service works just like your email. You’re free to call or text anyone in the world, even if they’re not TextMe Up users. You can also create multiple numbers and manage them from one account.