While surfing the world wide web I came across this very helpful set of links for the many Carrier BIS sites for your Blackberry.
Alltel: http://www.alltel.blackberry.com
At&t (Cingular) http://bis.na.blackberry.com/html?brand=mycingular
Centennial Wireless: http://centennial.blackberry.com
Sprint (Nextel): https://bis.na.blackberry.com/html?brand=nextel
Rogers: https://bis.na.blackberry.com/html?brand=rogers
Telus: https://bis.na.blackberry.com/html?brand=telus
T-Mobile (UK): http://www.instantemail.t-mobile.co.uk/
T-Mobile (US): https://my.t-mobile.com/Login/Default.aspx
US Cellular: http://www.uscellular.blackberry.com/
Verizon: https://bis.na.blackberry.com/html?brand=vzw or http://blackberry.com/go/vzw
Vodafone (UK): http://mobileemail.vodafone.gr/
O2: http://www.o2email.co.uk/
Vodafone (Croatia): http://mobileemail.vodafone.com.hr/
T-mobile Croatia: http://www.instantemail.t-mobile.hr/
Vodafone UK: http://mobileemail.vodafone.net
Digicel Jamaica: http://digicel.blackberry.com/
Bmobile Jamaica: https://bis.na.blackberry.com/html?brand=cwjamaica
Bluegrass Cellular: https://bis.na.blackberry.com/html?brand=bluegrass
T-Mobile Germany: http://instantemail.t-mobile.de/
Claro Dominican Republic: http://www.clarodr.blackberry.com//
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