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What is the problem that Nokia N97mini can't send text messages?

Has the SIM card of the mobile phone been changed? Maybe the SIM card and information center number of the mobile phone are wrong. The information center numbers of China Mobile and China Unicom are different! Sometimes mobile phones frequently change cards between mobile cards and Unicom cards, and the number of SIM card information center will not change automatically. Manual adjustment. You can adjust it in the SMS settings. Mobile starts with 138 and Unicom starts with 130.