help needed with c12 and o2 sim card

[sk3done]

high i have this problem i have old c12 mobile with a 02(btcellnet) sim in it were u top up with 15 pounds a mounth and it gives u free calls to 1 bt landline (wich i use to call sick aunt) problem is i wont to use this sim in my 5210 but the sim is tyed to the phone some how , i was wondering if anyone has managed to get round this , i have 1 idea i think it might be the imei they are using to lock the sim to phone and i was wondering if i just change imei on the 5210 to the phillips
imei will it then work??

any help would be nice

thannks in advance skedone

[Dinger3410]

networks cant lock tim cards to imei's.

it sounds like your other phone is GID1 locked. some networks use this to stop contract users putting thier sim in a payt phone.

I may be wrong, but that what it sounds like to me.

Dinger :)

[sk3done]

so if i use same gid code on the nokia the sim should then work in it?/