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

企業(yè)可以從以下等級(jí)中選擇適合自己的400電話號(hào)碼，在辦理電信400電話時(shí)，應(yīng)選擇正規(guī)代理商。

一類號(hào)碼后六位與aaaaaa相同。

一個(gè)數(shù)字代碼后五個(gè)相同的數(shù)字-500-400+aaaaaaaaa一個(gè)數(shù)字代碼后五個(gè)數(shù)字-4009+xabcde一個(gè)數(shù)字代碼后五個(gè)數(shù)字-一個(gè)數(shù)字代碼后五個(gè)數(shù)字代碼后五個(gè)數(shù)字代碼后五個(gè)數(shù)字代碼后五個(gè)數(shù)字代碼后四個(gè)數(shù)字-900-9-9-555一個(gè)數(shù)字代碼后四個(gè)數(shù)字代碼后四個(gè)數(shù)字代碼后四個(gè)代碼代碼后四個(gè)代碼后四個(gè)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