Because people are randomly adding your PIN & instant messaging you.
A Blackberry functions as a personal data assistant basically a mini computer. Blackberry's also has the exclusive blackberry messenger service so they can send instant messages to other blackberry's.
no, blackberry mail is for e-mails, blackberry messenger is instant messaging
blackberry messenger is a Instant messaging system you can do a lot more than texting alows you to do for blackberry to blackberry only.
yes
BlackBerry Messenger. Instant messaging on your BlackBerry, very good actually.
Voicemail, email messages, instant messages, data on handheld devices
no not really
contact your blackberry network
Blackberry to Blackberry messaging (BBM) is a way of text that is used by Blackberry owners. There is something called a pin, which is a series of numbers and letters, that is a "password" to adding someone into the contacts list. Blackberry to Blackberry Messaging is a form of instant messaging, just like Aim.
Instant messages
Yes, the BlackBerry 8820 supports sending and receiving MMS messages.
no