I use Groundwire. Before that I was using Acrobits Softphone (Acrobits also makes Groundwire).I've tried CSipSimple, 3CXPhone, Sipdroid, and Zoiper... all 4 have the same problem on my Samsung... they refuse to use the regular mic and instead only use the speakerphone mic (which is located up by the earpiece).
Acrobits Softphone will provide you ALL the functionality you want/need for less money than Groundwire. Works with my BT headset as well.
IMO, none of the free ones work well enough with my SGS3 for daily use. That's why I puchased Acrobits Softphone and later got Groundwire.
But to be honest, anymore I just add a Follow Me to forward to my cell number when i'm out as a Softphone really eats away at the battery. Using my cell plan minutes is not a big deal.
Other options for a phone in your home would be... you know what doc, PM me you phone number man. I got something for you.
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