What's the most reliable alternative to Firebase Authentication for SMS verification in Ionic...

I'm developing a mobile application using Ionic with Angular that requires phone number authentication via SMS. After experiencing multiple issues with Firebase Authentication, I'm looking for alternative solutions.

Current Setup:

• Ionic Framework (latest version)
• Angular as base framework
• Need to deploy for both iOS and Android
• Require only phone number authentication via SMS

Requirements:

• Easy to implement
• Cost-effective solution
• Proven to work reliably on both iOS and Android
• Must handle SMS verification codes
• Production-ready

What I've tried:

I initially implemented Firebase Authentication, but encountered several reliability issues, particularly with:

• Inconsistent behavior across platforms
• SMS delivery problems
• Integration challenges

What I'm looking for:

Alternative services/solutions to Firebase Auth Implementation examples or recommended approaches Real experiences from developers who faced similar issues

Any suggestions for battle-tested solutions that won't break the bank would be greatly appreciated.

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