Ok I am new to this so please bear that in mind. I am traveling overseas in a couple of days and have been trying to install sipdroid on my Nexus 1 to make free calls back to the US by using wifi instead of overseas carriers (very expensive) and save myself and family some dough. I searched on the internet and followed instructions to open sip account with smsdiscount.com, open and account with pbxes.com and finally download the sipdroid application to my phone. Everything works nice until I open the sipdroid application on my smartphone and it requests to put an address. No matter what I put it keeps saying " no suitable data network available" and I just cannot figure what is going on. I checked my wifi, it is working fine (I can browse) but I could not even find a solution by googling the phrase. I really am desperate and need this done before I leave in a couple of days, well less. I do not have Gizmo5, so that is not an option. I do have a googlevoice number. Your help guys is greatly appreciated. Thanks in advance.