After booting the iPhone 6S, it prompts there is no service. The iPhone 6S reports no service, which means the basic function for the phone can't be used, we can't make phone calls or sent messages, how to fix it? Here are some simple solutions.

1. Restart iPhone 6S
If it is cause by crashed software, you can try to fix it by restarting.
In order to restart iPhone 6S, please press and hold the iPhone power button until the slider appears, drag the slider to turn your device completely off, after the device turns off, press and hold the Top (or Side) button again until you see the Apple logo.
2. Check cellular network coverage
If you're not in an area with cellular network coverage, then your iPhone will show no service error. So, first check cellular network coverage, two situations,
One is if you're in the country, make sure that cellular data is on. In order to check iPhone cellular data, please go to Settings -> Cellular.
One is if you're in the overseas, make sure that data roaming is on. In order to check iPhone data roaming, please go to Settings -> Cellular -> Cellular Data Options -> Data Roaming.
3. Update IOS
After restarting, the problem still there, then you can try to fix it by updating IOS, two ways.
One way is that update IOS on the iPhone 6S, go to Settings -> General -> Software Update. In this way, you need to make sure your iPhone is connected to WIFI, and the iPhone battery percentage is above 50%.
The other way is that connect the iPhone 6S to computer with iPhone lightning cable, and then use iTunes to update it.
4. Restore iPhone 6S
After update IOS, the problem still exists, then try to last software solutions-- DFU restore iPhone. You can solve the deepest software issue by restoring. It will erase all data on your iPhone, so you need back up the iPhone before you restore it.
In order to restore iPhone 6S, please connect the iPhone 6S to computer with iPhone lightning cable, use latest iTunes to restore it.
If none of those solutions works, then we need to disassemble iPhone 6S by phone opening tools to check hardware problem.

1. Restart iPhone 6S
If it is cause by crashed software, you can try to fix it by restarting.
In order to restart iPhone 6S, please press and hold the iPhone power button until the slider appears, drag the slider to turn your device completely off, after the device turns off, press and hold the Top (or Side) button again until you see the Apple logo.
2. Check cellular network coverage
If you're not in an area with cellular network coverage, then your iPhone will show no service error. So, first check cellular network coverage, two situations,
One is if you're in the country, make sure that cellular data is on. In order to check iPhone cellular data, please go to Settings -> Cellular.
One is if you're in the overseas, make sure that data roaming is on. In order to check iPhone data roaming, please go to Settings -> Cellular -> Cellular Data Options -> Data Roaming.
3. Update IOS
After restarting, the problem still there, then you can try to fix it by updating IOS, two ways.
One way is that update IOS on the iPhone 6S, go to Settings -> General -> Software Update. In this way, you need to make sure your iPhone is connected to WIFI, and the iPhone battery percentage is above 50%.
The other way is that connect the iPhone 6S to computer with iPhone lightning cable, and then use iTunes to update it.
4. Restore iPhone 6S
After update IOS, the problem still exists, then try to last software solutions-- DFU restore iPhone. You can solve the deepest software issue by restoring. It will erase all data on your iPhone, so you need back up the iPhone before you restore it.
In order to restore iPhone 6S, please connect the iPhone 6S to computer with iPhone lightning cable, use latest iTunes to restore it.
If none of those solutions works, then we need to disassemble iPhone 6S by phone opening tools to check hardware problem.
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