10 best Android apps for VoIP calls1. Facebook Messenger
Messenger app is the best for VOIP calls. It's primarily for text messages. However, the app also includes support for video calls, voice calls, and SMS text messages. The quality is, of course, determined by your Internet connection speeds. Other than that, it works well enough. The app is a quite heavy on resource usage.
2. Google Duo
Google Duo supports just regular voice calls as well. Like most VOIP apps, everyone has to be on Duo for the calls to work. However, the app has excellent quality in both voice and video. It's actually quite simple. There is no extra stuff, no bloat, and it's all free. You just get your friends to sign up and get going. It also works with iOS devices. This may even come pre installed on some newer Android devices.
3. Google Hangouts
Google Hangouts is one of the better VOIP apps. It is primarily for texting, sending pictures, However, it also supports video calls, voice calls, and group calls. There is even an option to connect your Google Voice number for actual phone calls, SMS texting, and voicemail. It's also entirely free with no in-app purchases or advertising.
4. Magic App
Magic App is one of the most popular VOIP apps or SIP apps out there. It uses an actual phone number. The app also features cross-platform support, support for calling landlines, and even SMS support. The service isn't free, It costs $9.99 per year. That gets you unlimited calls to US and Canada, unlimited texts to any US phone number, and an actual phone number to use. It works fairly well on both mobile and PC.
5. Mizu Droid
Mizu Droid is one of the few regularly updated SIP apps on Google Play. It does require an existing SIP account already. However, it does support multiple SIP accounts, call diversion, VoIP tunneling and encryption, voicemail capabilities, and IM. The app is simple and it is completely free with no in-app purchases.
Skype is one of the most popular VOIP apps ever. It has a vast user base, direct support with Microsoft and Facebook, and it's fairly easy to use. The app is capable of voice calls, video calls, and text messages. It also supports landline calls with a nominal fee. This one has cross-platform support with multiple PC and mobile devices.
7. Signal Private Messenger
Signal Private Messenger is one of the best VOIP apps for privacy. It follows the trend of supporting text as well as voice calls. It doesn't have an overly huge list of features. However, it does have above average security, encryption, and privacy features. It also integrates with your existing phone number and contact list.
Viber features a full-fledged chat service, voice call service, and video calls. It also includes public chats, stickers, file attachments, and more. It's mostly free to use. Things like stickers cost a little bit of money. Otherwise it's a solid, cross-platform option in the VOIP and SIP space.
WhatsApp is the most popular messaging platform which supports voice calls as well as video calls. It's a rock solid platform with massive popularity. That should make it easier to get your friends to join the service so you can call them there. It also includes file attachments, multimedia support, integration with your address book.
Zoiper is unique in that it’s one of the few VOIP and SIP apps left. It focuses primarily on phone call features. It includes Bluetooth support, the ability to make decent calls even over bad Internet connections, IAX support, and support for a variety of other protocols. If you go gold, you can also get video calling support, call transferring, and even better audio.