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SIM900 Roaming Problem

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vigyanabikshu

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I have developed an on-line vehicle tracking system using SIM900. Everything works fine in local network, but while roaming, SIM900 always shows (AT+CREG:2) ,searching for a network. On a mobile phone the same sim card works fine on roaming. I also tried on the latest SIM800 module, that also fails. AT+CSQ gives 20-25. Please help me to solve the problem.

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