So if I dont put in a Turkish sim, I dont need to register my phone.
However, if I dont put in a Turkish sim, and carry on using my phone with my usual UK sim, my calls/texts costs will bankrupt me.
Sounds as though registering it, despite it costing £40 or so, will be the best option for me. Then again, my phone is getting old (I've given my last 2 upgrades to my son because I just couldn't be arsed spending an entire day setting up my new phone) and I never use the data access on it. So for me it might be better to just buy a Turkish one with sim.
Oh, I don't know.