This question is for an interface used on Mobile Phones, specifically for logging in to Mobile websites with the MSISDN of the user.
Currently the local version of the interface in question looks like this:
In the above sketch the *120*12345# string represents a USSD code presented to the visitor as a clickable link. This dials the USSD code and allows the customer to retrieve his PIN code.
I am localizing this application with the aim of deploying to a country that does not support USSD.
Would it be advisable to combine the PIN retrieval mechanism into this one interface, or should I have a separate page for inputting MSISDN that will send you the PIN?