Read and write permission for users not able to add their mobile phone to twitter


I am building a website where I need my twitter application to have the permission “Read and Write”. However, when I choose this option, I get an error saying:

“You must add your mobile phone to your Twitter profile before granting your application write capabilities. Please read for more information”

I tried to add my mobile phone to twitter but I get a new error when trying to do this:

“Sorry, we don’t have a connection to your carrier yet!”

I am from Cyprus, my carrier is MTN and now I cannot use my twitter application with my website!

What can I do now?