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2016年9月16日に発売。モデル番号は1660, 1778で GSM かCDMA があり。/ 32、128、 256 GB / 色はローズゴールド、ゴールド、シルバー、ブラック、ジェットブラック

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No services with Warning Sign

Hello, my iPhone started to boot loop, then I put it on recovery mode and restore it, finally it managed to open but now it shows me No signal with a warning sign.

Block Image

. Please let me know what to do.

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I have a same problem too...

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I have solved this issue. This is a motherboard problem and more specific on the baseband. This need microsoldering skills and you have to reball or replace the baseband.

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Here’s what you can try to do to fix the “No Service” after restoring problem. Let’s pray that iRobot doesn’t unjustly delete this answer too.

Solution 1. Restart or Force Restart Your iPhone

If your iPhone has no service or keep searching for service after iOS 12 update, you may need have a try by restarting your device to fix it. Actually, many common update problems can be solved by restarting the iPhone. And if restart is not working, you can try a hard reboot here.

  • For iPhone X: press and hold the Side Button and either volume button to turn off your iPhone; after your iPhone is completely turned off, press and hold the Top(Side) Button again to restart your iPhone.
  • For iPhone 8 or earlier module: press and hold the Top(Side) Button to turn off the iPhone and after your iPhone is completely turned off, press and hold the Top(Side) Button to restart your iPhone.

Solution 2. Reset Your Network Settings

Apparently, this no service issue is related to network, so you can reset your network settings to see if things go well. Go to Settings > General > Reset > Reset Network Settings.

Solution 3. Check Carrier Settings Update

If the carrier operator update their system, you need to update your carrier settings or your it will show no service or searching on your iPhone. Follow the steps to check for your carrier settings update.

Go to Settings > General > About and if you haven’t updated the carrier settings, you will see an option to update the carrier settings.

Check Carrier Settings Update

Solution 4. Take Out Your SIM Card and Insert Again

Sometimes, the no service is caused by the SIM card loosening or not being installed properly. So you can remove the SIM card and put it back again to see if the signal is back.

Solution 5. Change Voice and Data Settings

Sometimes, changing voice and data settings can fix this no service bug. Because some place is out of the coverage of a particular signal type. So you can just change the voice and data settings to see if the service is available. Just follow the steps:

Go to Settings > Cellular > Cellular Data Option > Voice and Data to change the voice and data signal types.

Change Voice and Data Settings

Solution 6. Contact Carrier Operator

If your iPhone is no service, maybe it is because the carrier you are using is under maintenance or your account is fees owed. So just contact the carrier to see if your carrier account is out of work.

Solution 7. Check Your Coverage Area

Make sure you’re in the area of cellular network coverage. Then follow these steps to fix the no service or searching problem:

Make sure your cellular data is on by going to Settings > Cellular Data and turn on it.

If you are travelling out of state, make sure you turn on data roaming on your iPhone. Just go to Settings > Cellular > Cellular Data Options > Data Roaming.

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Also, I apologize if this is spammy. I am unable to post links without iRobot moderating them, so I just copy-pasted what the website had.

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Apple will repair the device for free. More info: https://www.apple.com/support/iphone-7-n...

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you cant even open cellular Data . All it says is error so stop telling to open cellular data

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The antenna may have become dislodged.

While sitting down, turn your phone screen facing down in a horizontal position across your upper leg.

Firmly rock it left-to-right across your upper leg for about 5-10 secs. (Be careful not to do it so hard that you bend your phone).

Switch your phone to Flight Mode and back again to reinitialize the network search.

Repeat if necessary.

This should re-seat the antenna and restore network connectivity.

I had exhausted all other software options, and this is the only thing that actually worked for me! I've been doing this for a few weeks now and it consistently restores service to my iPhone 6. I still lose network every few days (sometimes multiple times in a single day), but this method restores it every time.

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Replace BASEBAND power ic PM9645 located near audio ic at the backside of motherboard.

If no repair history of phone then ur phone willb ok by PM9645 else u have to reball Baseband CPU.

It can be done by professional only

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Savvas Giannoukas さん、ありがとうございました!
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