To have a residential phone line you need to have a valid residency permit or have a Turkish person guarantee the line for you.
Residential Telephone Line
Apply at the Turk Telecom office (from the Maliye building over the roundabout towards Gunlukbashi across from the filling station on the left).
You will need your residency and a tax number to complete the application.
You will also need the address and telephone number of a neighbour who can be contacted about the potential installation.
Installation is generally to the junction box in your property.
You are then advised to get an electrician to connect the line through into your property at an additional cost.
If you are a competent DIYer you should be able to do it yourself.
You can purchase calls from Turk Telecom or another provider by arranging an account.
Check out the Turk Telecom website for other services and charges – website is in English
Important Phone Numbers
International Operator 115
Directory Enquiries 118
Telephone Line Faults 121
Wake up call 135
Area Code Assistance 199