Right now, the membership settings have 4 methods:

For option 2. Phone number required, customers only need to enter their phone number to access the store — but it’s not verified.

I suggest improving this by adding a WhatsApp OTP verification step (similar to option 3). This way:

Customers entering a phone number must verify it via a WhatsApp code

Ensures real and accurate numbers

Reduces fake or spam entries

This would combine the simplicity of option 2 with the security of verified phone numbers.