What to do if you can no longer afford your phone bill
Contact and negotiate
Contact your provider and negotiate a change in payments.
Switch your provider to another in return for a reduced rate.
Put a cap on bills
Put a cap on your monthly bill, including phone, text, and mobile data charges to avoid surprise bills.
Unfortunately, if you are struggling to pay your phone bill, it is unlikely you will be able to cancel it without having to pay the total amount in full, in addition to expensive cancellation fees.
If you miss payments on your phone bill, then your account will fall into arrears, and you should try and pay this debt off as soon as possible. If you are unable to, you will most likely be contacted by the provider to secure the payment. If this is not possible then they will generally disconnect the mobile and begin legal proceedings to chase the missing payments.