When you activate your line with a pay as you go plan or decide to change it, you choose the minutes and GB you want to have. After activating the plan you need to have enough balance or make a top-up similar to your plan rate so the minutes and GB will activate automatically and you can start using them for 28 days. If you want to check your balance, find out here the way to do it and if you want to know which is your plan and if you got any minutes and GB available, find here how to know it.