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SIM not registering in SIM300 GSM modem

hi,

i dont know if this is the right place to ask this question but i thought i might ask...any help would be much appreciated.

i am using a GSM modem specifically SIM300 and the sim is not registering to the network...i checked it using the AT+CREG? command and it returns +CREG:0,2 which means it is searching for an operator to register to. after sometime on the query again i get +CREG:0,0 which means it is no longer searching for an operator. it is a new sim(tata docomo) which works fine in a cell phone. when i use a sim from a different operator(vodafone) it is registering.

i googled for this problem and i could see one other person who faced this problem but there was no solution provided there.

if you have a solution or any troubleshooting please let me know. thanks in advance!

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