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I called Tmo to bitch about the fact this phone won't allow tethering but other Tmo phones can. They offered me $10 a month credit for 2 years but at the same time renew a 2 years contract today. I budged... but I'm not going to sign up that $15 WIFI tethering feature. I switched to the $49 unlimited talk, text, data plan for 2 years.. now it comes $39.. that's good deal I think =)
http://prepaid-phones.t-mobile.com/prepaid-plansYeah, they are. I bought myself a Galaxy S 4G to test how fast T-Mobile "4G" is in my area using the Pay By Day $3 plan. If that works fine, I'm getting the new $30/month plan and will cancel the tethering plan on my AT&T iPhone.Funny how prepaid plans are looking more and more attractive.

You might be able to use your phone to tethering. That doesn't mean you have the tethering plan included in your plan.
Does it show on your bill? Or when you login to my.tmobile.com, or using the "My Account" program in your phone, that feature is showing in your plan?
i'm using Barnacle Wifi Tether (needs root)Need a wifi tethering option...any available? Have the OG Droid and tether with it. Upgrading to the GS2 here and def will need it. Root an option to get it?
if you phone is rooted...use a file explorer app/titanium backup to find and delete tether manager app...DONE.