Sereno26 @ 06/21/19, 01:30
There are several options: this is a separate USB-modem, and WI-FI modem. but both of these options require a separate SIM card and, accordingly, costs. However, many people have a lot of Internet phones in their tariff plan, and there is often nowhere to put it.
At the black-and-yellow operator, I connected the Internet at all service in due time. The bottom line is this: there is sim1 on the phone with the usual tariff, Internet, etc., and there is sim2. When connecting the service, a special tariff is set on sim2, which eats the Internet and SMS from sim1, but voice calls are disconnected. A couple of years ago, up to three SIM cards could be connected to the main tariff.