Hello guys!

I am working on my diploma project for school, which is a website where users can register and cook for each other. Since there will be a point system, it is important that one person cannot register multiple accounts. Therefore users have to enter their mobile phone number when they register and will then receive an SMS with an activation code which must be entered on the website.

Now my question is: How can I implement this SMS registration? I have already added an additional field "phone number", but the data which is entered in this field is not stored in the database, how can i change this?