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You can still use it
No, you can only get 4G service on 4G compatible devices. It is possible that the next iPhone released will be 4G compatible although that is still unknown at this point.
The iPhone 5 is a 4G LTE phone.
The Samsung Dart is not a 4G phone, it is a 3G phone. You will not be able to use it to connect to a 4G network. You'll need a 4G phone to connect to a 4G network.
because your country might not have the 4g network instaled yet
That is still on the coming soon list, but you can use skype which is really good now.
Many aircraft have WiFi capability, but it normally costs money to use it. Use of phones and 3G/4G is still prohibited.
No
It depends on how your signal strength is on the 4G network. 4G is fast but if you have a good wifi connection it is suggested you use wifi for even faster file transfers but its your choice to use 4G or wifi.
No. You cannot use a t-moble sim card in a Evo 4G LTE.
I just got a nes sisekick 4g phone,I need help on how to use
The Samsung Transform is only a 3G networking phone. It however still allows you to use your phone as a wi-fi device to connect your home network. It is just as good as the 4G networking with the great memory as a bonus.