Vyke Mobile with WiFi S.W.1.0.6
the author of this app says:
Vyke Mobile saves you up to 95% on international calls and text messages by using your mobile phone's WiFi connection to send your call or message instead of using your regular mobile operator. Whenever your phone is connected to a WiFi hotspot you save on your international calls and text! If your friends, family and colleagues use Vyke Mobile too, then you can call and text each other completely free of charge! Whenever you and the person you are calling are both in a WiFi hotspot and using Vyke Mobile, you'll be able to see each other online and call and text each other for free! When you don not have access to a WiFi hotspot or if your phone does not have a WiFi connection, you can still save money on your international calls and text with Vyke. With Vyke Mobile you can set up your phone to automatically send every single international call and text message over the Vyke network, without you ever even having to think about opening Vyke Mobile! Now you can guarantee that your calls and text messages will be as cheap as possible without having to do any of the work! Because Vyke Mobile uses your phone's WiFi connection to connect to the Vyke network whenever you're in a hotspot, there are no international roaming charges to pay when you send messages or call using Vyke Mobile's WiFi feature from overseas! We're convinced that you'll like Vyke as much as we do, so when you sign-up for your free account we'll make sure that you have enough credit to make your first calls and send you first text messages completely free of charge!
Symbian phone with WiFi required.