This extract is taken from :
http://www.o2.co.uk/support/generalhelp ... orewith901under
Mailbox settingsYou can store up to 40 messages or minutes of messages in your mailbox. Each stored message can be up to four minutes long, and if you reach your storage limit we'll let you know.
Messages can be stored for
up to 30 days if you're a Pay Monthly customer and up to 17 days if you're a Pay & Go customer. We'll let you know before your stored messages are deleted.
Other options for voice mail allow you to forward your messages to another mobile on a different network which may have a longer storage period.
Options available whilst listening to messages :
Retrieval Menu
• Key 0 - Pause or continue message
• Key 2 - Save message
• Key 3 - Delete message
• Key 4 - Skip back 5 seconds
• Key 5 - Return the call
• Key 6 - Skip forward 5 seconds
• Key 7 - Forward the message directly to someone else - (Post-pay only)
• Key 8 - Hear the time and date the message was left
• Key 9 - Choose a text reply to send - (Post-pay only)
Hope this helps