I've been collection these for awhile and find they're very useful where wifi isn't available. You should be able to use all of these even without a data plan or while using prepaid, does not cost you anything! Many thanks to Vitaliy, Thesandlord and overfloat for discovering most of these. Please add your own if you know of others!

4info: http://wap.4info.net/
AccuWeather: http://www.accuweather.com/m/
airG WAP Games: http://tmobile-gamespace.airg.ca/Air...54151&fn=lbbCd
Bank of the West: https://www.bankofthewest.com
BBC: http://news.bbc.co.uk/low
Bravo: http://tmobile.bravo.starcut.us/
CIA: https://www.cia.gov
CNN: http://tmobile.cnn.mlogic.mobi/
Cosmopolitan: http://cosmo.mlogic.mobi/
Discovery.com: http://discovery.mlogic.mobi/
E!Online: http://tmo.eonline.mobi/
eBay: http://tmo.ebay.com/
ESPN: http://m.espn.go.com/
Evite: http://m.evite.com/
Facebook: https://www.facebook.com
Fifth Third Bank https://www.53.com
Gmail: https://mail.google.com/
Google: https://www.google.com
Google Reader: https://www.google.com:433/reader/m/view/?hl=en
HBO: http://hbo.mlogic.mobi/
InStyle: http://instyle.mlogic.mobi/
Lonely Planet: http://m.lonelyplanet.com/t-mobile
Maemo Garage: https://garage.maemo.org
MapQuest: http://wap.mapquest.com/wap3/locatio...ersion=tmobile
MLB: http://m.mlb.com/
Moviefone Location: http://wap.aol.com/moviefone/tmobile/home.do
MTV: http://tmobile.mtv.strarcut.us/inf/infomo?site=mtvt
MySpace: http://wap.myspace.com/login.wap?bfd=tmobile
National Geographic: http://tmobile.natgeo.mlogic.mobi/
NAVTEQ Traffic: http://traffic.go2.com/traffic/?PARTNERNAME=GO2TMOBILE
NBC: http://m.nbc.com/?deck=T-mobileon
PayPal: https://mobile.paypal.com/
People.com: http://people.mlogic.mobi/
Perez Hilton: http://perezhilton.mlogic.mobi/
Radar: http://radar.net/
Red Carpet: http://redcarpet.kargo.com/tmobile
Scroogle: https://ssl.scroogle.org
Seventeen Magazine: http://seventeen.mlogic.mobi/
Sports Illustrated: http://tmobile.si.mlogic.mobi/
SyFy: http://tmobile.syfy.starcut.us/
TBS: http://tbs.mlogic.mobi/
Traffic.com: http://mobi.traffic.com/
TLC: http://tlc.mlogic.mobi/
The Tennessean: http://tennessean.mlogic.mobi/
The Pirate Bay: https://thepiratebay.org
Union Bank: https://www.unionbank.com
USA Today: http://usatoday.mlogic.mobi/
USBank: https://www.usbank.com
Wikipedia: https://secure.wikimedia.org/wikipedia/en/wiki
Yahoo! Front Page http://m.yahoo.com/
Yahoo! Mail: http://us.m.yahoo.com/
Yahoo! Messenger: http://m.yahoo.com/w/bp-messenger
Yahoo! Social Pulse: http://m.yahoo.com/w/oneconnect
YouTube: http://m.youtube.com/?client=mv-tmobile-uk

Enjoy!