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This is a list of telephone area codes in the U.S. state of Michigan: 231 – Northwestern Lower Michigan : Traverse City, Ludington, Muskegon, Petoskey, Big Rapids and Cheboygan 248 – Northern Metro Detroit : All of Oakland County, Northville, and most of Northville Township; overlays with area code 947
Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.
Some cities have also implemented rate center consolidation; fewer rate centers resulted in more efficient use of telephone numbers, as carriers would reserve blocks of 1,000 or 10,000 numbers in each of multiple rate centers in the same area even if they had relatively few clients in the area. [46] (A rate center is a geographical area used by ...
Map of area codes 248 and 947 in Michigan. Area codes 248 and 947 are area codes in the North American Numbering Plan (NANP) for Oakland County in the U.S. state of Michigan . The area codes also serve portions of Livonia and Northville , both located in Wayne County .
Area code 231 was created in June 1999 by an area code split of area code 616, which had served the entire western half of the Lower Peninsula, extending west from the north-south line aligned with the Mackinac Bridge. 231 was carved out of the northern part.
Prior to all of this, when numbers were one digit shorter than they are today, a wide mix of prefixes were in use, from the well-recognized 0891 and 0898 prefixes to others such as 0331, 0345, 0645 and 0660. Day to day regulation of premium rate services passed from the Phone-paid Services Authority (PSA) back to Ofcom from 1 February 2025.
As a result, 616 was now mostly coextensive with the core of West Michigan. Muskegon is universally counted as part of West Michigan, but was now in 231. The 1999 split was intended to be a long-term solution for the region. However, within two years, the proliferation of cell phones and pagers brought 616 close to exhaustion.
The channel data rate for all 8 channels is 270.833 kbit/s, and the frame duration is 4.615 ms. [23] ... Comparison of mobile phone standards; GEO-Mobile Radio Interface;
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