Earlier quoted context omitted.
I haven't heard anything neither, although I tried hard to call everyone. Maybe some portion of prepaid tariff sim cards could be having it as they had some other types of ads in the past. Maybe you're right, could equally be "fake news".
Definitely not "Fake News". TRT(Turkish equivalent of BBC) reported that the stunt was organised by the BTK(Information Technologies Committee, govt. body): http://www.trthaber.com/haber/gundem/gsm-operatorlerinin-abo...
But I guess, the BTK guy, went too far to put the 10sec celebration message of the president to celebrate the official national public holiday. Just FYI - on prepaid tariffs there's already some kind of ads by mobile operators.