Trouble with MMS. Most of the time they just never come neither to me when sent by someone else nor to the recipient when sent by me. Sometimes they come, but without the content (pics)
I dont have internet, I only have the feature enabler from t-mobile
Has anyone else had the same problem?

I have the same problem... if I ever send picture or if someone sends one to me, it never sends. I (or the person im sending to) don't even get a message.

Do you have an MMS entry in Options? If so, suggest set up as follows:

MM reception: Home Only
Auto Retrieval: Always

Notifications:
Allow Delivery Confirmation - checked
Allow Read Confirmation - checked
Confirm Delivery - checked
Confirm Read - unchecked
Message Filtering - both boxes unchecked

Also worth checking with your carrier that MMS is provisioned on your account, particularly if you've recently changed your tariff.