Shortcode service charges are shown in the promotional material or adverts, and the standard charge is 15p per message.
For contract customers, charges will appear under the Premium Shortcodes—sent & received—or Texts to other networks section of your bill. Charges for voice shortcodes will show in the Calls to premium rate and other services section.
For Pay As You Go, charges will be deducted from your credit balance. So, you must have enough available credit to cover the cost of texting or calling the shortcode.
Most shortcode services will send you 1 or more messages as part of the service, and you may be charged for 1 or all of them.
If a message starts with or was sent from FreeMsg or similar, you won't be charged and it won't appear on your bill.
Some services you've used may appear in the ThreePay section of your bill. Find out more about ThreePay.