Screen protectors, old ones in particular, can cause problems with an iPhone’s touch screen. Try using a new screen protector if one is available. If not, retailers like Amazon sell them.

How to Fix a Touch Screen That Isn't Working We've found that the following steps can help a touch screen start working again. You should try them in this order, but some may not apply to your device.

A dirty iPhone screen can affect your iPhone's ability to detect changes in charge (which is how a touch screen works). Ultimately, this can cause your iPhone's screen to not respond to your touch.

It can keep working on more advanced technology, such as under-screen Touch ID, but having Touch ID in the side button would be a huge perk in the meantime.