I to have an iMac and BT, my usage so far for June is 69.43GB download, 5.22GB upload but this is not a problem as I have unlimited broadband. I pay £36.34 per month for line rental,unlimited broadband,BT Vision, free evening & weekend calls. The BT hub should be secure, e.g. a password is required to connect to internet via wireless. The original password is set by BT and shown on a removable tab, for example: Wireless network/SSID: BTHub3-X2S3 is the hub identity seen on internet when connected. Wireless key: 3e8e82f95e is the password required to connect via wireless connection. (Both shown are examples only) Its easy to check if your connection is secure on iMac as follows. When connected open Safari, on the menu bar, top right, hover over, or click on the wireless connection symbol,a drop down menu will appear showing your connection to your hub appears with a tick mark to left of hub name/id. To the right of id a symbol of a closed padlock should be visible confirming a secure connection. If there is no padlock or you feel that another person has obtain your key/password you can change settings, hub id & key/password by logging into your BT account online:- (How do I change the WEP key for a wireless connection to my BT Home Hub using Mac OS-X?
Find your Hub's wireless network name/SSID and wireless key, printed on a label on the back of your Hub.
How do I find the wireless network name (SSID) and wireless key for my BT Home Hub or router? How do I find the wireless network name (SSID) and wireless key for my BT Home Hub or router?
Click on the apple icon (top left), select 'System preferences', select 'Network', highlight 'Airport'.
Select 'Advanced'.
Highlight the relevant hub and click on the Edit icon.
Click 'Allow' if prompted to allow access to your keychain.
Type the 10-character wireless key for your Hub into the Password box.
Click 'Add'.
Click 'Allow' if prompted to add this to your keychain.
Click 'OK'.
Click 'Apply'.)
Re BT Vision. Vision is basically a free view box but with inbuilt internet connection for catch up TV, e.g. BBC i player etc or pay to view programmes. If you use "catch up or "pay to view" you are basically downloading programmes which will increase your download usage but BT are unable to advise the download usage for Vision! If you want to ensure that your download usage is not effected by BT Vision disconnect the ethernet cable from box to modem. Also remember that sending/receiving e-mail & just opening Safari browser effects your usage!!!