Glossary180e-mail. In addition to the text content of SMS, MMSmessages can contain still images, voice or audioclips, and in the future, also video clips andpresentation information.Multiparty callingAbility to establish a conference call involving up tofive additional parties.PIN (Personal Identification Number)Security code that protects the phone/SIM againstunauthorised use. The original PIN is supplied by T-Mobile with the SIM card. It may be a four to eight-digit number and can be changed, as required.PUK (PIN Unblocking Key)Security code used to unlock the phone when anincorrect PIN has been entered three times insuccession. The eight-digit number is supplied by T-Mobile with the SIM card.RoamingUse of your phone when you are outside your homearea (when travelling for example).SDN (Service Dialling Numbers)Telephone numbers supplied by your networkprovider and giving access to special services, suchas voice mail, directory inquiries, customer support,and emergency services.
