How to disable the service "Unlim Internet" depends on your chosen mobile operator. So, for example, for the monthly not written off funds from the accounts of modem or telephone by employees of the company "MegaFon", you need to dial a special command to deactivate the option. There are two ways to disable:

Send a message to the number 000929 with a special code. It can be obtained on the official website of the company by choosing their place of residence.

Type the command *105*3400*2#. After performing this action, the operators should turn off your current rate.
As for the mobile operator MTS, to refuse their services in three ways:

Dial on the keypad of your mobile phone: *252*0#. In response to a message that the service was disconnected.

Send SMS to the number 2520: 2520.

Disable the option using the "Internet Assistant".
To stop using the service of mobile operator "Beeline", you must type the command: 0674090. After performing this action you will receive a response that you previously set option was disabled successfully. In some cases, this method may not work, so you need to contact the operator "Beeline" and solve the problem.
As for the cellular operator "Tele 2", here to disable the service is very simple. Dial on your mobile phone command: *105*235*0#. Within ten seconds, you will receive a return message that says that you have successfully disabled the service.