Планета гаджетов / технологий
Setup SIP account on android phones and tablets with getonsip. It allows you to make free Wi-Fi calls without using google voice and skype. Full tutorial for Motorola, Nexus, Samsung and Sony Xperia devices.
http://www.pcnexus.net/2014/06/how-to-setup-sip-account-for-voip-calling-android-without-google-skype.html
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