forgot my passcode for iPhone

There is an Apple article that explains what to do if you have forgotten an iPhone or iPad passcode. Click on the following link: How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support

If that option is not available, you will need to use a computer. See:

If you forgot your iPhone passcode - Apple Support

You will need to restore the device using a computer. The process will erase the device. Later you can restore your data from a recent back-up. Instructions here…

If you forgot your iPhone passcode - Apple Support