Tele2 has a service for selling minutes, GB and SMS. There you can form a lot from unspent traffic and
The company has published a notice of changeson your website. “Starting January 20, 2021, the balances of packages of minutes, gigabytes and SMS transferred from the previous billing period as part of the “Transfer of Balances” functionality become unavailable for sale on the Tele2 Market service,” writes Tele2.
Previously, there were no such restrictions.Now, you can only sell packages available at a tariff. Why Tele2 made this decision is unclear. Content Review suggests that in the future the company may even close this "attraction of unprecedented generosity".