The Apple Inc undoubtedly is the most charismatic company . It’s epoch-making products are popular all over the world as soon as the products are released,such as iPhone and iPad . Now , many people have their own iPhone . With the Apple age’s coming , some unpredictable phone failure occur . Here is a good example . Here is a good example .IPhone 5S has no service when inserting SIM card. So how to solve the problem . The solution is below.
“About iPhone” displays IMEI, modem firmware and ICCID, as shown in picture 1-57.
Picture 1-57
IPhone does not show IMEI when dial *#06#.
Check operator and there is China Mobile, China Telecom but no China Unicom (picture 1-58). Under normal circumstances, the three operators will show up at the same time.
Picture 1-58
China Mobile and China Telecom showing up suggests part of the signal channel circuit is normal. The trouble is in baseband CPU. Remove the baseband CPU and Reballing Stencil on it. Reassemble it and enter system to test. IPhone has signal now and it is normal to call. Therefore, the trouble is removed.
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