Twitter issue with the mobile Nr.

Dear all.
Currently I am setting up the easyblog component for a client so it can auto-post in her FB and TW account.
But I am NOT able to create an app at http://dev.twitter.com as it ask me to add a mobile nr. to my twitter account. but when I "try" to add the number to the account it gives me a quite silly reply. So if i can NOT add her mobile nr. to the TW account I will NOT be able to create an app. This is quite strange tough because for another client "@conexografico" i could create an app and yes. I just checked and I did NOT add for this account a mobile nr.
Please see for your selfe...
https://twitter.com/conexografico
user: xxx
PW: xxx

Am I confused? Am I doing something wrong _again_?
Details for this case:
twitter account: http://twitter.com/thotelmassage
username: xxx
Pw: xxx

Easyblog installation: http://v2.tantramassagehotel.net
Admin of this site: http://v2.tantramassagehotel.net/administrator
user: xxx
pw: xxx

After looking around I found this:
https://support.twitter.com/articles/14226-how-to-find-your-twitter-short-code-or-long-code
But this means sending like 3-4 sms to a foreign country.

Can you help me out with this issue plz?
Hoping to hear from you.
Regards,
Paco