For T-Mobile there's a 3.8.0.128 update, most people shipped with .112 (I think).
At any rate, even doing an update will not fix this issue.
It seems to affect phones randomly.
It's the tone that's supposed to be played ONLY through your handsfree set (not bluetooth one). Instead of being played only through the handsfree set, it's being played through the regular handset earpiece speaker. No amount of fanagling the device seems to change this outcome. I think it only plays if it vibrates however.
It's a known bug and who knows if they fixed it in the unreleased (to T-Mobile) 4.0 version.
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