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I'm confused about that. Why would it be necessary to disable iMessage?
 
I can confirm iMessage does not need to be disabled when setting up a Series 3 LTE Apple Watch on T-Mobile.

I'm confused about that. Why would it be necessary to disable iMessage?

If multiple numbers are used on the same iPhone, iMessage will get confused at to what is the phone's "real" number and be constantly activating and deactivating the phone number integration on iMessage. This isn't how DIGITS works with the Apple Watch, however, so no need to worry.
 
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