Unlock old iPhone without a PC or Mac

As you know, you have to reset the passcode on your iPhone by following this procedure ➔ If you forgot your iPhone passcode

The procedure requires the use of a computer. There is no getting away from that. Try and borrow a computer from a friend or a family member (PC or Mac).

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if you don't know know your old phones password and only need to unpair the Apple Watch you can follow this guide to unpair directly from the watch: https://support.apple.com/en-au/HT204568