Regarding use of phones and SIM cards, I recommend using a company called SIM corner. Especially if you are staying for 4 or 5 days.
I've bought from these several times for trips all over the place, and data coverage has always been fantastic, including mountains and rural areas. You don't get calls and texts but don't have to worry about being connected to WiFi for your full holiday, good for using WhatsApp, Google Maps etc.
Stay connected in Turkeye with our 6GB SIM card for 15 days. Perfect for travelers. Buy your Turkeye SIM card from SimCorner UK!
uk.simcorner.com
Relevant link above for the correct product. £24 for 15 days worth of data, just stick it in the phone when you land. Use code TRAVEL5 to get it for ££22.80.