I bought a new iPhone 4 iOs 4.2.1 with bandwidth of 3.10.01 they said to be unlock. When I put my Etisalat Sim it works fine but I cannot send MMS or SMS. I tried to reset all the settings but it doesnt make any change on it. I can call whoever in my contacts even the landline but I cant and even received SMS or MMS. Can anyone help me on this thing.