Here's what a combined T-Mobile-Sprint network spectrum coverage would look like

After a few unsuccessful merger tangos with Comcast and other eligible bachelors, Sprint and T-Mobile are back at it, it seems. The two smaller US carriers are again exploring a partnership or buyout of some sorts, tip analysts, and have apparently agreed to the broad strokes, with the details still being ironed out, and an announcement likely to come as soon as next month.

The thing is, both Sprint and T-Mobile carry enough weight to result in a formidable alliance in terms of subscriber numbers, rivaling the two big boys Verizon and AT&T. When ...