If you are subscribed to Etisalat Blackberry Internet service, your BIS will automatically be renewed once it expires provided you have enough airtime on your Etisalat SIM card. If you want to stop Etisalat from automatically deducting your airtime for BIS, you will have to dial the code for deactivating Etisalat BIS.
To deactivate etisalat Blackberry Complete, Social and BIS Non-Voice plans? Dial *399*2# from your BlackBerry device and wait for the confirmation of your status.
You can check out Etisalat website for more FAQ's on Etisalat BIS.