What are the special solutions for devices with GPRS in the matter of cellular services?

Question

Arduino

Devices - sensors, through GPRS give data for monitoring and everything that is required from GSM.
The goal is for the end user of the device to have fewer problems with the purchase of a SIM card, etc.
What are the options?
If important, regions - Moscow, Moscow region

Answer 1

In the matter of purchasing and distributing SIM cards, there are various options for interacting with mobile operators:
1) you sign an agency agreement with the target operator and give SIM cards along with devices.
2) you agree with the operator to distribute devices with their SIM card through their communication stores.
3) you generally register an MVNO operator and already sell your SIM cards.
4) in the market from any Tajik selling covers, buy a pack of SIM cards in bulk and distribute them with devices.