Why the phone confirmation?

 
Title says it all - why do I need to confirm by sms to my phone? What if I don't have a phone?
 

I can't find any forum rules, So I assume this is allowed until told otherwise


- Anybody have an answer?

I don't have a cell phone. I might be able to borrow one from a friend if absolutely necessary but I'd prefer some other way..

 

Anyone?
 

Nowadays it is an usual way for internet payments. I don't know what to answer you.
Reason: