Tell me more about the SIP!
Wondering if it would be helpful to put on my iPad, but I do love my iPhone.
I have a dedicated VOIP number in Thailand (for friends and business associates to use), that you can call from any phone in Thailand - local call. Then it rings my device (whichever I'm on - my Windows laptop, my HTC Touch Pro2 phone, or my Android tablet) to pick up.
Also have Skype numbers in Germany, Chile, Hong Kong, and the US. And I can call out to those countries through Fring a very low rates as well...
You’d need access to an IP enabled phone system to make it work. Then your sysadmin sets up the app just like it was a hard phone. Voilà it works anywhere you can get a decent signal.