If the problem is the risk of losing the user attention, what about sending an activation code via…
Cadu de Castro Alves

It depends on your objective. In our case we wanted to verify a user has access to the email address in which case an SMS wouldn’t do us much good. We don’t have or need the user’s telephone number.

I imagine in some cases though, especially on mobile, using SMS verification to ‘verify’ someone’s identity can be a better alternative.

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