If you allow your account balance, you can get some beeps, and then hang up. This is the dialler. In that case, if your balance is zero, you will be able to stay connected thanks to this service, as a "Beacon." The operator "Beeline" connection this service is not required, it is automatically available to all subscribers. To send the Tracker dial on your mobile dial *303# the recipient's number# and then press send call. Once the subscriber receives your request, he will get back to you.
If you are a subscriber of "MegaFon", then there is a "Call me" service. Send someone a request to call back number *144*number# (by the way, specify a number in the format +79ххххххххх). After sending the request the other party will receive a message that says "Subscriber "Your number" asking to call him back", and you will receive a delivery report.
The service "Call me back" provides the mobile operator "MTS". Requests can be sent for free to subscribers, not only within the network but also the subscribers of "Megaphone", "Beeline" and others. To send a message with the text "Call me" is very simple: you simply have to dial a USSD-command *110* the number in ten-digit format and #.