I'm in Istanbul for a couple months and my phone is broken but it's still under warranty. I would like to send my phone back home to get it fixed but as I don't speak Turkish and I find it's quite hard to even ask for a postoffice or DHL or FedX.
My question is also general but also specific for Istanbul since I'm here right now. How do people send valuable things back home? It's also a plus point if they have a pick-up service (e.g hotel or apartment).