Different sim I have a telstra sim card and I also have an optus one, but where I Live i dont really get telstra reception so i would like to use my optus sim, but the phone i got off ebay my motorolla hiptop is locked to telstra, so i would just like some sort of code to let me use my optus sim.
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yes - optus uses a different frequency range for 3g data than what Telstra uses.
The phone you have a ZTE T303 works on 3G UMTS 850
optus 3g runs on 3g umts 700
the only way to unlock a phone is to call the original company andtell them u want it unlocked for international travel. using it for another co. is illegal though so be carefull!
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