You get 15$ for testing
Signup for Twilio. Use below link to get 10$ on your first spending
Quickly setup your account & skip to dashboard.
Click on "Get a Trial Number".
From your dashboard, copy "Account SID, Auth Token, Trial Number" to your mobile login service settings.
If you're still on a Trial account, you need to verify phone number where you want to receive SMS for testing. You can add numbers here