Premium SMS messages are paid third-party SMS services. A premium SMS service number always consists of four digits such as 4411.
Since extra costs are charged for these premium messages on top of your mobile subscription, it is best to check with the provider whether they allow this.
If premium messages are not allowed, we may not receive your sent messages (to start a parking session). As a result, we cannot reply to your message, so that you have not started a valid parking session and so you can receive a fine.
If you send a message to 4411 to start a session you will receive a confirmation from 4411. If you have not received a confirmation, no session will have started.
Note: It is possible to disable confirmation messages by sending the command C1 to 4411..