Regardless of who your mobile carrier is, you will most certainly need to look elsewhere, and you're not like to get much help from them in finding a mobile VoIP service. The good news is that the market has seen a rush from these offerings in the past year, and there are dozens to choose from. Most are built to reduce or eliminate both roaming and long distance charges, and if you do a lot of international calling, a bit of homework here would be time well spent.
Even a quick Google search will turn up many mobile VoIP services, but I'm not going to name any here -- it wouldn't be fair to all the others out there. What I will say is that you should learn first about the basic types of mobile VoIP services. Some will only work with a WiFi connection, some require both parties to call a common number, and yet others call you back once your party is connected. If your smartphone is WiFi-enabled, you can use pretty much any service out there, and then it's really a matter of choosing the type of mobile VoIP service that suits your situation.
Dig Deeper on VoIP Migration and Implementation
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