Nextel Communications Inc, the Specialised Mobile Radio king, has a decidedly junky credit rating of triple-C-plus, but at least it is not getting any junkier. Standard & Poor’s Corp affirmed the triple-C-plus senior unsecured debt rating and said it may upgrade the triple-C senior unsecured debt rating of Dial Page Inc and unit Dial Call Communications Inc folling Nextel’s announcement that is will acquire Dial Page for about $750m in shares and will assume Dial Call’s $300m of rated debt.