Report a busy signal Msen uses multiple phone companies to provide dialin service. In many calling areas, Msen offers more than one phone number covering the same calling area. Blue numbers are the prefered phone number to be calling for a given city. If your calling area is covered by a blue access number, please try it as Msen has determined that this number gives the highest connect rate and the least problems for most customers. If a black number is also listed for your area, you may wish to create a second connection for backup.
Black numbers are the backup phone numbers to call.
Please note that if there is no blue number for your area, this number will be fine. The route your call takes to connect to Msen will affect your modem speed. While the majority of customers will have faster speeds with the blue numbers, you may check the black numbers to find out which connection works best for you. Note that Ameritech does not guarantee the accuracy of this information. If possible, it is best to do this from the phone line you plan to use.