It is a killer combination and I'm doing it for a while with Nexus S and CSipSimple App while roaming abroad.
I'm from Europe. And best part is that my mobile operator has SIP gateway, so wherever abroad I am, I always get myself local 3G data SIM card (it's 10 EUR for 1GB on average) so I can use data as much as I want, and I can call and being called (with my own number) with prices just like I would be back home - cheap.
Even better is that I can also send SMS with same app (again from my own number). Classic way, when abroad it can be anywhere from 0.15 EUR to 0.40 EUR per SMS when roaming.
Sending SMS works on EDGE, but for calling it needs to be 3G. Sound can delay from time to time, but it's a small price for keeping home-network-prices wherever in the world I am.
I'm from Europe. And best part is that my mobile operator has SIP gateway, so wherever abroad I am, I always get myself local 3G data SIM card (it's 10 EUR for 1GB on average) so I can use data as much as I want, and I can call and being called (with my own number) with prices just like I would be back home - cheap.
Even better is that I can also send SMS with same app (again from my own number). Classic way, when abroad it can be anywhere from 0.15 EUR to 0.40 EUR per SMS when roaming.
Sending SMS works on EDGE, but for calling it needs to be 3G. Sound can delay from time to time, but it's a small price for keeping home-network-prices wherever in the world I am.