Does find my friends work with international numbers?

Greetings, Candace.
I see you have a question regarding the Find My Friends application on your phone. You'd like to know if it will work with international numbers. I'll be glad to help you with this.
About Find My Friends -- You came to Apple Support Communities from the correct article. Your friend needs to have set up Find My Friends on their device. You add them through their email address to send the request.

Add a friend

To use Find My Friends, your friend needs to have Find My Friends on their device too. You can only add friends from Find My Friends on your iPhone, iPad, or iPod touch.

1. Open Find My Friends.
2. Tap Add.
3. Choose a friend or enter your friend's email address, then tap Done to send the request.

Thanks for using Apple Support Communities and have a great day!