Softphone - full-featured VOIP softphone

The VOIP Softphone provides all the features you have in your fixed line, but in your mobile (transfer, extend, conference, etc.). The feature 'Answer in GSM' lets you take calls even in narrowband connections.

iPhone, Android Yes, up to 2 simultaneous calls.
iPad Yes, answering in GSM is available only on the iPhone. Softphone interface is available both on the iPhone and the iPad.