No cell signal, but connects to WiFi, detects No SIM, IMEI, carrier

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iPhone SE

发布于2016年3月，是一款同时拥有着iphone 6s般的硬件规格以及4英寸屏幕体积的iPhone。有深空灰色、银色、金色及玫瑰金色四种配色以及16/64GB容量可选。国行型号为A1723和A1724。

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Jennifer Hu @jlhu

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发帖于: 2018年11月7日

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No cell signal, but connects to WiFi, detects No SIM, IMEI, carrier

I got a used iPhone SE with “broken cellular data but everything else fine”. It does seem fine, just some faded spots on the screen and cosmetic scuffs, and I thought the cell service fix would be easy.

I swapped the cellular antenna (and loudspeaker) with the corresponding part from my functioning iPhone 5s, but this did not solve the issue. (In fact, the SE cellular antenna works great in my 5s, so I know it was not the antenna’s fault.)

I do not think this is the carrier’s fault. I called T-mobile and they said the SIM was activated and should be working fine. I am able to make and receive calls through WiFi calling using the SIM card too.

Any ideas as to what could be going wrong, or how I could diagnose? I have a working iPhone 5s, so I can swap parts in and out (if they’re compatible) as needed to check if they are working.

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arbaman @arbaman

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发帖于: 2018年11月7日

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Try dialing *#06# on the numeric pad, you should be greeted with the IMEI number. If that doesn’t happen it is a Baseband chip issue. Trubleshooting a no service failure is among the most complicated jobs..half the phone is covered with chips handling communications and they are all interconnected one way or the other.

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IMEI number does appear on screen after typing *#06# ! It isn’t a baseband chip issue then?

由 Jennifer Hu 完成的 2018年11月7日

Yes, that should be working fine, but wouldn't know what to advice besides checking antenna connector which you have already done. You can run a DFU restore with 3Utools not to let the easier step untried.

If you feel like it, you may try taking out of the phone the logic board and see if it works with just battery, screen and lightning connected in case there might be some short along the housing.

由 arbaman 完成的 2018年11月7日

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IMEI number does appear on screen after typing *#06# ! It isn’t a baseband chip issue then? — Jennifer Hu
Yes, that should be working fine, but wouldn't know what to advice besides checking antenna connector which you have already done. You can run a DFU restore with 3Utools not to let the easier step untried.

If you feel like it, you may try taking out of the phone the logic board and see if it works with just battery, screen and lightning connected in case there might be some short along the housing. — arbaman

iPhone SE

No cell signal, but connects to WiFi, detects No SIM, IMEI, carrier

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