For a long time I was having trouble using the firebase authentication system for phone numbers in ionic + capacitor. I got so frustrated I put it on the backburner and made a long post about it on stackoverflow (https://stackoverflow.com/questions/66573679/ionic-capacitor-firebase-phone-number-authentication-problems) I have finally got it working using the https://github.com/baumblatt/capacitor-firebase-auth library and https://github.com/angular/angularfire library. So thank you to those coders <3

Before you start, it is recommended that you are experienced with ionic, capacitor, and firebase.

1. Create a firebase project and enable phone number authentication. Also make a web api key and ios api key. (Follow this tutorial if you get confused https://github.com/angular/angularfire/blob/master/docs/install-and-setup.md, from step 3 to 7) (Also follow this tutorial if you get confused on the ios part: https://firebase.google.com/docs/ios/setup)

Make sure you replace the GoogleServices-Info.plist in the ios project and add your firebaseConfig specs in the environment folder

2. Follow this tutorial to sync your APN in firebase https://stackoverflow.com/questions/45091583/invalid-token-when-trying-to-authenticate-phone-number-using-firebase

It should look like this at the end:

3. On line 17 in home.page.ts make sure you set phoneNum to the phone number of your phone

4. Run npm install, then run ios cap sync

5. Navigate to your the Xcode .workspace project in ios/App/App.workspace and setup your signing certificate.

6. Connect an iphone to your computer and run the Xcode project on an Iphone

• If your run into a problem, make sure to let me know in the issues section!
• Also, if this project is helpful for you, I'd really appreciate it if you'd give it a start on github!