You must strictly follow these Cryptotab instructions.
You install Cryptotab on your mobile phone and then you level up. You must have absolute prof in this app. if you install litl you will never achieve your goals. this will be annoying for you.
Do the same with other mobile phones and tablets. You should always buy different app for all phones. For this, you need to open different google mail for each Phone or Tablet. After completion, purchase Cryptotab upgrade for each volume. It's easy from here.