How can you avoid problems linked with receiving SMS & MMS for which there is a charge?
Monitor access to your mobile by third parties so as to avoid anyone ordering services without your knowledge (a child or someone you know).
Do not enter your mobile number in mailing lists or mailing forms without reading the conditions you are agreeing to, such as on the internet, forums, competitions and other lists. Many forms contain little indication such as ""I am interested in receiving information / advertising on other products"", which is equivalent to allow sending business SMS.
Closely examine the conditions of the service you wish to subscribe to before sending your SMS & MMS command to the short number given.
Keep information on how to deactivate the service in a safe place so you can cancel the service quickly at any time.