Normally, all mobile users have access to be able to buy and pay for services via the mobile bill. With some mobile companies, however, there will be certain subscription types that are blocked as default for payment via the mobile bill. Similarly, it will also often be the case that companies have blocked the employees’ opportunity to make purchases with payment via the mobile bill.
4T does not have access to see what options you have with your subscription. If you are not able to make a payment, then you need to contact your carrier.
4T encourages all mobile phone users to use the options available to secure the phone against unauthorized use. On many phones and smartphones, it is possible to secure with extra pin codes or screen lock.