Ian, sorry, been away for a couple of days. When we got off the Dolmus at the Mosque, we dropped down on to the main road and left towards the centre of Fethiye. A 100 yards or so on the other side was a phone shop. We bought a brand new Nokia for (from memory) £30 or so. It doesn't have any model number on it but it is the same basic model you can buy here. The girl in the shop fitted a Turcell sim card in and registered it. It came with 5 or 10 minutes free talk and we bought extra time through the phone online, as required. Total amount at the shop was certainly around £40. Sorry cannot be more precise but I left the bill and paperwork in our apartment. Not surprised about you experience at Migros. We only went there once and were horrified at the prices in general. It seems to be set up for tourists who don't want to risk trying the local shops.
Harry & Sheila