Iphone stuck in restart?

Hi guys need help my iPhone 6s has just out of the blue started restarting itself its not letting me get past the home screen and sometimes not letting me past the apple logo really starting to annoy me iv tried foed restore and reboot won't happen because I need my phone number but I can't get into the phone to get it please help

Call the service center of apple

2 possible solutions:

1: Your phone's battery is bad. This happens naturally after some time and this is my best guess at what is happening to your phone. Visit your nearest Apple Store and have them run a diagnostic.

2: Your firmware is glitching. My next guess is that the firmware (the things in your phone that connect the software to the hardware), may have gotten glitched. Try holding the power button and home button for about 30-60 seconds until you see the apple logo. If the logo never shows up then try visiting your nearest Apple Store

Are you trying to start it while it is connected to a charger? If not, then give it a try.

How long have you had the phone? Why do you not know the number? If you really don't know the phone number, try asking somebody who you have called or texted or have contacted you what your number is.

If you mean the IMEI number, look on the outside of the phone's box.

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