Python one-liner to the rescue again. (Horribly formatted this time tho)
f = lambda x: print(*[x[:len(x)-1]+str(int(x[len(x)-1])+1), x[:len(x)-1]+str(int(x[len(x)-1])-1)])
>>> f('555-555-5555') 555-555-5556 555-555-5554
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Python one-liner to the rescue again. (Horribly formatted this time tho)
f = lambda x: print(*[x[:len(x)-1]+str(int(x[len(x)-1])+1), x[:len(x)-1]+str(int(x[len(x)-1])-1)])