電信有400電話，電信400電話是4008和4009，從數(shù)字等級可以分為六個等級。

企業(yè)可以從以下等級中選擇適合自己的400電話號碼，在辦理電信400電話時，應選擇正規(guī)代理商。

一類號碼后六位與aaaaaa400-999-5555相同。

一個數(shù)字代碼后五個相同的數(shù)字-500-400+aaaaaaaaa400-999-5555一個數(shù)字代碼后五個數(shù)字-4009+xabcde400-999-5555一個數(shù)字代碼后五個數(shù)字-400-999-5555一個數(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400-999-5555/9/9/9/9/9/9/9/9/9-5/30-5-5-5-5-9-5-9-5-9-5-5-5-9-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5