1) Same technology (CDMA)
2) 10 million additional customers at no extra operating cost - max savings
3) LTE right away in multiple markets
4) Extra spectrum
5) 66 million customers - close the gap with verizon/att and further weaken t-mobile
6) Extra cash - PCS has some 2.5 billion in cash
To add to your list, MetroPCS also has $1+ billion in annual EBITDA, since Sprint is operating at a loss and has tons of loss carry forward, most of this $1+ billion will be tax free for several years if MetroPCS and Sprint merged. Combine this extra billion income and the $2+ billion cash MetroPCS to Sprint's balance sheet, Sprint's future refi and debt default expenses are going to be significantly lower as well.