At this time, the Attensi platform requires a phone number to authenticate users during registration.
After your initial account setup (i.e. your first time logging in), the "Username and Password” login option could be used moving forward – meaning users are only required to enter a phone number the first time they log in.
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A valid phone number is required to validate users on the platform as well as allow users to facilitate password resets.
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See also: How do I know what my username is? | Creating an Account