extracting data for user preferences from a contract for services, wherein extracting data comprises generating a blockchain ledger of user preferences for entity preference of vendors and category preference of vendors;

tagging users of the services with the user preferences using the blockchain ledger of user preferences, wherein the tagging of users is configured in a hierarchical tree indicating services preferred by the users;

receiving the promotional offers from the vendors;

classifying the vendors as being in a home area of a home network including home antenna and home network interface or roaming areas of a roaming network including roaming network and roaming network interface for the service, the roaming network and the home network each being a SIM-based telecommunications network;

tracking the users through movement of a cellular device by tracking cellular signal strength in the home network or roaming network for the user that is receiving the services to determine whether the user is in the home area or the roaming areas;

matching the promotional offers from the vendors to the user preferences from the blockchain ledger using the hierarchical tree with a neural network analysis in a cloud computing environment according to the tagging of the users simultaneously with sensing a change in network presence of the users from between the home network and the roaming network, the blockchain ledger providing user consent to receive promotional offers in combination with the hierarchical tree and the neural network analysis to reduce user utility in the cloud computing environment, wherein the promotional offers are from the home area of the home network or the roaming area of the roaming network;

sending matched promotional offers to the users according to the tagging concurrently with the users entering a home area or roaming area through the SIM-base telecommunications network, wherein roaming matched promotional offers specific to the roaming area are sent to the user when using the roaming network and home matched promotional offers specific to the home area are sent to the user when using the home network.