iPhone unavailable and has no timer

To unlock an unavailable iPhone 7 without a timer, and without a MacBook, PC, or any software, your best option is to use iCloud’s "Find My iPhone" feature. You can remotely erase your device to unlock it.

Here’s a guide that shows the steps you can follow: Erase a device in Find Devices on iCloud.com - Apple Support.

Make sure to have your Apple ID and password ready, as you'll need them to set up the iPhone again after erasing.

[Edited by Moderator]

You will need access to a PC or MAC. Your only option is to erase and restore.

If you forgot your iPhone passcode, use your Mac or PC to reset it - Apple Support