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2014年9月19日に発売されたこのiPhoneは4.7インチのスクリーンサイズでiPhone 6 Plusの縮小版です。

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All parts used for cellular service

Hi I recently had some 6er iPhones with same problem. They did not find cellular connection. Some didnt recognize the SIM from start (remove and put it back in made it work), but also no service or searching after this without finding connection. As far as I know every single phone dropped at least once but no water damage (indicators were white)

I'm interested which components are used to get cellular service and how to fix these problems. Last time I replaced the USB port with all that stuff, but this helped only for some seconds, after this the same happened again. I'm running out of ideas and I am glad if someone could assist me there

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iPhoneのバッテリーキット

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iPhoneのバッテリーキット

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This is a belated answer so hopefully it can be of use to folks who search for and find this question.

After you have eliminated antennae or network locks as the possible culprit, searching issues on the iPhone 6 are usually related to the baseband IC. The baseband IC is very sensitive, just like the Touch IC's on the 6 Plus; it also suffers from poor quality traces and pads.

Go to your phone’s dialing keypad and dial *#06#. You should see the IMEI displayed.

If the IMEI is not displayed, the Baseband IC has to be reballed and two small copper traces (U1/V1) have to be rebuilt and solidified. This is commonly referred to as the “long jumper” solution. You can check out this answer (Service is "Searching" indefinitely) (by @teetopp) as it summarizes the issue really well.

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richard さん、ありがとうございました!
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