Heads up to anyone with T-Mobile US and has a legacy 10GB data plan (such as the myFavs plan with the data addition). T-Mobile just denied that I ever had that plan and that they ever offered it, claiming they never offered 10GB before late 2011. This is absolutely untrue and I've had this plan since my Blackberry Curve 8230 years ago.
They also claim that they never offered free tethering/hotspot even though they always had free tethering until the Sensation ICS upgrade and newer. This is the first time I actually used any more than 5GB in a loooooong so I never actually noticed, but anyone who has a legacy 10GB plan should call to make sure it's still there, cause they changed mine.
TL;DR Legacy 10GB data plans might have been changed to 5GB and T-Mobile will deny you ever had it.
They also claim that they never offered free tethering/hotspot even though they always had free tethering until the Sensation ICS upgrade and newer. This is the first time I actually used any more than 5GB in a loooooong so I never actually noticed, but anyone who has a legacy 10GB plan should call to make sure it's still there, cause they changed mine.
TL;DR Legacy 10GB data plans might have been changed to 5GB and T-Mobile will deny you ever had it.