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!
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