This is actually quite good. Bear with me...
If you find yourself in the UK texting someone in Turkey, it is not cheap. I get 5000 free texts a month but the ones I send to Turkey cost me 24p each.
If you are the opposite way, in Turkey but texting people back home in Blighty, that too can be expensive.
Fishtext (stupid name I know) is 2p per text to Turkey and 2p per text to UK from Turkey.
The real beauty of this over some alternatives is that you send the text to the recipients phone, where it arrives as a text. They reply on their phone like they normally reply to a text and send it and it arrives on your phone as a text. You get the idea, it doesn't appear in an app, they don't need to have Fishtext at all, you don't need to have a program on your pc - it's texts sent as texts and replied as texts. But 2p each.
Anyway, you get 20p credit for free (not much but it's 10 texts for nowt so you can try it out) - and if you are a big texter to or from Turkey, that's going to save a lot of cash.
If you want to give it a go...
http://www.fishtext.com/