Can I use my Nexmo virtual number to sign up for WhatsApp, Facebook ,etc?
Can I use my Nexmo virtual number to verify my identity with my bank?
Nexmo Virtual Numbers can absolutely not be used to verify users with apps such as Facebook, Viber and especially with financial institutions. Repeated attempts to do so will result in account suspension.
You can find the 'Acceptable Use' policy here AUP: Acceptable Use Policy