What is national roaming and how can I use it?
As a Mobile Viking you use the Play network. If this network is not available you can use the network of T-Mobile, Plus and Orange.
On this network you will be able to use your free data and texts and the calling rate will be the same as well.
The data speed will reach the maximum while on Play network (LTE, max 70 mbit/s), while on T-mobile, Plus and Orange - max 3 mbit/s.