To use the service roaming chargesand must specify the information in the Contact centre of cellular company by calling the number 111. The operator should know whether roaming in the country you plan to visit, the cost of the service and whether you have the service international and national roaming.
If you are satisfied with the settings, activate the service on your tariff, roaming service can be connected in the office or through the call center.
On arrival, you must register the sim card in roaming. As a rule, this happens automatically. If this does not happen, then you need to disable and re-enable the phone and manually find an available network for the call.
To make a call, you must know some features of the dial.
The standard is set at the Federal room in national roaming (8-xxxxxxxxxx-call), for calling on landline number and added the area code (8-343-xxxxxxxxx-call), to call to another country it is necessary to additionally dial the country code (8-555-343-xxxxxxxxx-call).
The international roaming charges for the call are added 00 before the rest of the numbers (00-8-555-343-xxxxxxxxx-call)