From Turkcell's own site they state 34.4 million subscribers in Turkey. Including their affiliates in Azerbaijan, Belarus, Georgia, Kazakhstan, Moldova, Northern Cyprus and Ukraine they had a total of 62 million subscribers as of March 31, 2010 so they might be close to the Wiki number now. That's immaterial since SPARE isn't claiming a presence in those countries.
Hotstocked is taking us to SPBU vague 8-K that makes no mention of Turkcell or a number of subscribers. They leave it up to us to add an apple + and apple and come up with an orange.
There "might" be a M-Budget Mobile deal through LSG but certainly no Turkcell.