3、没有信号那张SIM卡接触不良，SIM用的时间长了或者经常拔插SIM卡也会引起卡与手机接触不良。此时就必须要检查SIM卡及电话电极，假如不干净，可用防静电的布来清洁一下再重新插上试试。
4、检查手机卡槽有没有损坏，假如是卡槽损坏，只有更换卡槽。
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