My preferred method is to use a camera rather than a phone, put it on a proper tripod and use a wired remote. However, carrying a large-ish tripod everywhere isn't practical so the alternatives are
- Use a gorilla pod or similar to improvise a tripod from a standard lamp or other item of hotel room furniture!
- Traditional selfie
The problem with using the self timer is that autofocus focuses in the wrong place and manual focus is a pain!
Of course, the best alternative is a friend who knows what they're doing!