| Mac Address | 
            A 3-bit address used to distinguish units
            within a piconet. 3 bits allows for only 8 unique address, thus the limit on the number of
            devices allowed to participate in a piconet. | 
          
          
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            | MAL | 
            MSIsdn-Alert | 
          
          
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            | MAP  | 
            Mobile Application Part | 
          
          
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            | Master Unit | 
            This is the device within a piconet whose
            clock and frequency-hopping sequence is used to synchronize all slave units within the
            piconet. | 
          
          
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            | MDS | 
            Multipoint Distribution Service. Licensed
            spectrum in the 2.1GHz band. | 
          
          
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            | Microbrowser | 
            A Web browser specialized for a smart phone
            or PDA. It is optimized to run in the low-memory and small-screen environment of a
            handheld device. | 
          
          
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            | MMDS | 
            Multipoint Multichannel Distibution
            Service. Licensed spectrum in the 2.5 2.6GHz band. Range is 30 miles or more. | 
          
          
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            | MML  | 
            Man Machine Language | 
          
          
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            | MMM | 
            Mobile Media Mode is an icon that
            identifies Web content optimized for smart phones and handhelds. | 
          
          
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            | MMS | 
            More Messages to Send | 
          
          
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            | MoU  | 
            Memorandum of Understanding | 
          
          
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            | MR | 
            Message Reference | 
          
          
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            | MS | 
            Mobile Station | 
          
          
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            | MSA | 
            Metropolitan Service Area. An urban area
            with at least 50,000 people plus surrounding counties. There are 306 MSAs and 428 RSAs in
            U.S. | 
          
          
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            | MSB  | 
            Most Significant Bits | 
          
          
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            | MSC  | 
            Mobile Switching Centre | 
          
          
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            | MSCA | 
            MSC Address | 
          
          
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            | MSI | 
            Mobile waiting Set Indication | 
          
          
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            | MSIsdn | 
            Mobile Station ISDN number | 
          
          
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            | MSM | 
            More Short Messages | 
          
          
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            | MSRN | 
            Mobile Station Roaming Number | 
          
          
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            | MT | 
            Message Type | 
          
          
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            | MTBF  | 
            Mean Time Between Failure | 
          
          
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            | MTBR  | 
            Mean Time Before Repair | 
          
          
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            | MTI | 
            Message Type Indicator | 
          
          
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            | M-WorldGate | 
            Logica's proposed cHTML gateway | 
          
          
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            | MWS | 
            Message Waiting Set |