Since the question does not specify what the ancient telephone with, I shall compare it to a fish.
The 5 differences between an ancient telephone and a fish are:
The ancient telephone was a man-made device, the fish is not.
The ancient telephone was used for communication, the fish is not.
The ancient telephone can survive longer outside of water, a fish cannot.
The ancient telephone was not alive, a fish is.
The ancient telephone had a mouthpiece, a fish has a mouth.
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Check the differences between consecutive numbers.
5 digit telephone numbers having at least one of their digits repeated is = total possible 5 digit telephone numbers - 5 digit telephone numbers without any digit being repeated. =(10*10*10*10*10)-(10*9*8*7*6) =100000-30240 =69760
5/13+4/25
There is not enough information to answer the question. The pattern could be 1 (+1) = 2 (+3) = 5 (+5) = 10 ... where the differences are the odd integers, or 1 (+1) = 2 (+3) = 5 (+6) = 11 ... where the differences are the triangular numbers, or 1 (+1) = 2 (+3) = 5 (+9) = 14 ... where the differences are powers of 3, or many, many other possibilities.