- 05-31-2007, 06:08 PM #1Newbie
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I have an old Nokia 3120 GSM with a valid SIM (about 3 years old). I wanted to keep my old plan so I bought an LG CU400 on EBAY. The CU400 came without a SIM card. When I transferred the SIM card, the CU400 said my SIM from my Nokia is invalid. The Nokia sim is for ATT/Cingular and the new phone has Cingular written on the face of the phone. I thought all GSM SIM cards were compatible. Do I have to unlock the phone?
The SIM card fit into the CU400 perfectly, that is, it physically fit. Do I need a newer SIM card or just unlock the phone? If I need a newer SIM, how do I get it working to my old plan? I am getting the impression that I need a 64K sim that works with 3G. Is this correct? If I buy a new 64K SIM on Ebay, will Cingular activate it or will they force me to sign a new contract? Is my old SIM useless with newer phone that has 3G? How can I retain my old plan?
HELP!
› See More: Help - Invalid SIM Card CU400Last edited by loves-tech; 05-31-2007 at 07:13 PM.
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