Another scam option

Today they called from the number + 7-919-599-91-84 and introduced themselves as the technical service of the telecom operator (at least they could find out by my number that the operator was Beeline).
Asked to answer a couple of questions:
1. About the quality of service
2. About cases when calls or SMS did not pass.

Then they explained that a planned replacement of equipment is underway now and all the numbers are being transferred to more powerful equipment, in this connection they asked to name the phone brand (answered that I do not understand phones) and asked to enter * 102 so that the number was transferred to new .

In response to my refusal, they said that according to clause 4.2 (or 4 simply), if it is technically necessary, I must follow all instructions of the cellular operator.
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Questions to the audience:
1. So I understand 919 - this is not Beeline?
2. If you enter the coveted code * 102, then what will we get or lose as a result?

PS I understand that for any habrachelovek this is an obvious divorce and he will not succumb to this. I think that we need to take care of our loved ones.