MY iPhone PW appears to have spontaneously changed. I cannot get in and am traveling in Paris... Critically need phone!!!

Hey there, TonyHull,

Thanks for visiting the Apple Support Communities.

There are two was you can regain access to your iPhone:

1. If you're having trouble with the passcode to unlock your iPhone and have iOS 15.2 or later, you might be able to follow the steps outlined in How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support to remove it and regain access to your iPhone.
2. If you have an earlier iOS version, or the method in step 1 does not solve the issue, you'll need to utilize a Mac or Windows PC to get back into your iPhone. The steps in If you forgot your iPhone passcode - Apple Support will guide you through how to do that.

Best!