As Akia pointed out, you can change the APN settings. However, your device will still have the Telelcom firware, so it will still try to access tworld? as one of the shortkeys.
It is possible to debrand the phone, by flashing it with new firmware. But you do run the risk of bricking your phone. I have done it successfully with this exact phone, it did take me an hour or so to flash, as there are a lot of different firmwares out there.
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