Talki-Walki or GSM cell-phone ?!

I wonder wtf is going on with MCI (mobile telecom co. of Iran). At current setting in (current) BTS, my cell-phone conversations are as safe as if they`re transmitted over an FM radio !
For the record, this is a sample screen-shot from my mobile, connecting to a BTS in Tehran.
There are A LOT to write on this (GSM security) topic but contents are too offensive to be covered in a blog.