Glossary181MMS (Multimedia Message Service)A message service for the mobile environment,standardized by the WAP Forum and the 3rdGeneration Partnership Program (3GPP). For phoneusers, MMS is similar to Short Message Service(SMS)-it provides automatic, immediate delivery ofuser-created content from phone to phone. Themessage addressing used is primarily phonenumbers, thus the traffic goes from phone tophone. MMS also provides support for e-mailaddressing, so that messages can also be sent bye-mail. In addition to the text content of SMS, MMSmessages can contain still images, voice or audioclips, and later also video clips and presentationinformation.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 PIN is supplied by theservice provider with the SIM card. It may be a fourto eight-digit number and can be changed, asrequired.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 bythe service provider with the SIM card.
