The GSM MoU has specified certain features that need to be implemented.

These are classed in Phases

	GSM Phase 1 features
	GSM Phase 2 features
	GSM Phase 2+ features

GSM Phase 1 features

• Call Forwarding
• All Calls
• No Answer
• Engaged
• Unreachable
• Call Barring
• Outgoing - Bar certain outgoing calls
• Incoming - Bar certain incoming calls
• Global roaming - Visit any other country with GSM and a roaming agreement and use your phone and existing number*

GSM Phase 2 features

• SMS - Short Message Service - Allows you to send text messages too and from phones
• Multi Party Calling - Talk to five other parties as well as yourself at the same time
• Call Holding - Place a call on Hold
• Call Waiting - Notifies you of another call whilst on a call
• Mobile Data Services - Allows handsets to communicate with computers
• Mobile Fax Service - Allows handsets to send, retrieve and receive faxes
• Calling Line Identity Service - This facility allows you to see the telephone number of the incoming caller on our handset before answering
• Advice of Charge - Allows you to keep track of call costs
• Cell Broadcast - Allows you to subscribe to local news channels
• Mobile Terminating Fax - Another number you are issued with that receives faxes that you can then download to the nearest fax machine.

GSM Phase 2 + features

• Available by 1998
• Upgrade and improvements to existing services
• Majority of the upgrade concerns data transmission, including bearer services and packet switched data at 64 kbit/s and above
• DECT access to GSM
• PMR/Public Access Mobile Radio (PAMR)-like capabilities
• GSM in the local loop
• Virtual Private Networks
• Packet Radio
• SIM enhancements
• Premium rate services
• Enhanced Data-over-GSM Speeds