電信400電話辦理流程如下所示：一類號碼后六位相同，400+aaaaaaa。

一個數(shù)字代碼后五個相同的數(shù)字-500-400+aaaaaaaaa一個數(shù)字代碼后五個數(shù)字-4009+xabcde一個數(shù)字代碼后五個數(shù)字-一個數(shù)字代碼后五個數(shù)字代碼后五個數(shù)字代碼后五個數(shù)字代碼后五個數(shù)字代碼后四個數(shù)字-900-9-9-555一個數(shù)字代碼后四個數(shù)字代碼后四個數(shù)字代碼后四個代碼代碼后四個代碼后四個代碼代碼/9/9/9/9/9/9/9/9/9-5/30-5-5-5-5-9-5-9-5-9-5-5-5-9-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5