they send you an MMS with the barcode if you check a box on the online ticket form.

Turkish Airlines has been letting its customer mobile check-in for over 2 years now. What is the big deal that Reg is publishing this article.

The "Fast Bag Drop" counter is just the same old check-in counter with a different name. Unless you're travelling with hand luggage only, the only advantage of online/mobile check-in is you can try to bag your favourite window seat a few hours earlier - saving all of ten seconds at the counter after waiting in a twenty minute queue. The downside is no opportunity to try to charm your way into a free upgrade.