Hi,
All you clever folk probably already know this, but I only found out last September, so thought it would be good to share with those that do not know.
I went to buy Turkcell Kontors to top up the Turkish mobile, and the guy asked me if I was going to be phoning UK. I said yes, and he said I would be better off with "packets". He then said that for 10 Lira I could speak to the UK for 1 hour, but I could only buy "packets" once in any month. I said that I was only out for a couple of weeks and bought 3 packets for 30 Lira, for 3 hours talk-time.
Thinking I might have been scammed, I was quick to check and delighted to find that I had bought 3 hours talk-time to UK. He gave me a different balance checking code for the packets, and that tells you how many minutes you have left for that month. The best bit is that it even worked when calling UK mobiles.
When we came back this year in May, I went back to the same guy, asked for "packets", and for 20 Lira bought 2 hours talk-time to UK.
The phone still used the Kontors for calls to Turkish numbers and for texts, but all calls to both UK landlines and UK mobiles, were included within the packets.
I shall be doing the same again at the end of next week, when we are out for another couple of weeks.
I hope that this is of interest, and of use to some who may not already know about it.
Cheers.