Mobile Lowdown 04-28-11: AT&T/T-Mobile; Apple iCloud; Buongiorno

Our look at some of the big stories in mobile today: Small mobile operators band together against the AT&T (NYSE: T) proposed purchase of T-Mobile USA; the question over iCloud.com and Apple; (NSDQ: AAPL) and a new mobile payments service from Buongiorno. —AT&T/T-Mobile USA: More competitors are stepping up in their objections to the proposed acquisition of T-Mobile USA by AT&T....