Phone Authentication with Kotlin

Phone Authentication is another method of Authentication in Supabase. The Kotlin library provides a easy way to integrate Phone Auth in your App.

Setting up a SMS provider

Before you can try out Phone Auth, you have to setup a SMS provider in your Supabase Dashboard. There you can also customize the SMS message and the OTP, the user receives.

Signing up with a Phone number

After you setup everything, you can easily create new users with a phone number:

val user = client.gotrue.signUpWith(Phone) {
    phoneNumber = "+12345678912"
    password = "password"
}

If you enabled phone confirmations, the user should receive a phone message with an OTP. You can use this OTP to confirm the sign up and login:

client.gotrue.verifyPhoneOtp(
    type = OtpType.Phone.SMS,
    phoneNumber = "+123456789",
    token = "123456"
)

If this was successful, the user is logged in!

Logging in with a Phone number

Passwordless SMS login

Phone Authentication allows passwordless login, allowing users to login with just their phone number:

client.gotrue.sendOtpTo(Phone) {
    phoneNumber = "+123456789"
}

Once received, verify the OTP:

client.gotrue.verifyPhoneOtp(
    type = OtpType.Phone.SMS,
    phoneNumber = "+123456789",
    token = "123456"
)

Phone login with Password

Phone login with a password can also be done:

client.gotrue.loginWith(Phone) {
    phoneNumber = "+1234567891"
    password = "password"
}