reply to PastTense
Re: What happens now for us T-Mobile subscribers? The "challenger strategy" appears to focus on growth in prepaid services. Bullet points 4 and 6 both talk about non-contract services.
As of June 30, 2012, T-Mobile had 21.3 million postpaid customers, 5.3 million prepaid customers, and 3.8 million MVNO customers. (2.8 million M2M, but those aren't people, so I won't count them.)
MetroPCS had 9.3 million "subscribers" -- presumably all prepaid.
If you do the math, the combined company will have 21.3 million postpaid customers, vs. 18.4 prepaid and MVNO.
This is quite a change! T-Mobile has gone from a 2:1 postpaid/prepaid split, to practically 1:1.