This can be for a variety of reasons, some listed below:

Insufficient funds – this may happen if you’re a Pay As You Go customer and you may need to top up your credit

Barred – you have a premium rate bar on your phone - some service providers put this as default when you start contract and you may not be aware. You need to contact service provider to release this bar

Max Spend – you may have a weekly or monthly spending limit on your phone bill for premium services and you will need to contact them to get this removed or increased.

If you continue to have problems please raise a ticket on Help Page with as many details as possible and we will try to resolve the issue.