If your iPhone is stuck on a loop at the start screen, there are many things you can do to resolve it. these are the easiest to perform and the most popular too.
Perform a ‘Hard Reset’ on your iPhone
The safest way to go is to force a 'Restart' or 'Hard Reset' on your iPhone if it doesn't go off. These are the ways for each model.
iPhone 6 and Earlier
For the iPhone 6 and earlier, you need to press and hold the ‘Home’ and ‘Power’ buttons down together.
iPhone 7 and 7plus
For this model you need to press and hold the ‘Volume Down’ and the 'Side' button until the Apple shows on the screen.
iPhone 8, 8 Plus and X
A sequence of keys is pressed in a consecutive manner is what the latter models of iPhone require for a 'Hard Reset'. Press the 'Volume Up' button and then the 'Volume Up' one and finally hold the 'Side' button down until the screen goes black and the Apple appears.
‘Restore’ it Using iTunes
iTunes can be a great ally in breaking your phone´s cycle of looping at the start. Let´s go through the easy steps to get that done.
Step 1
Connect your iPhone to your computer
Using the cable that suits your phone plug it into the device that has the iTunes installed.
Step 2
‘Update’ & ‘Restore’
iTunes will launch immediately and once it detects your phone is an issue, it will ask you to restore or update it. if you are sure that it has the latest software, you can just 'Restore' it, otherwise, you can press 'Update'.
If the pop up doesn't come up, then you can do it manually.
Step 3
‘Restore’ Manually
You can go to the ‘Summary’ option on your 'iTunes' and 'Restore' it from there.
Step 4
‘Power Off’ your Phone from that Same Menu
Once you have reached this menu inside the device, you need to put your finger in the 'Lock Screen' option. Once you keep it pressed, you can shut your phone down from that screen.
Now the issue is resolved, you can enjoy using your iOS device.