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While looking at iPad models, I notice several showing as (MM).

In particular, the 4th generation iPad mini with Cellular has models A1454 and A1455 with the latter being labeled (MM). The same exists for A1459/A1460 on the larger iPad with a Retina display.

What does MM represent?

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I do not have a direct link or citation on/about Apple to prove my conclusion. But the most logical answer I could gather by reading several sites is that MM would stand for "Multi-mode", signifying that the iPad supports not just CDMA and GSM, but also multiple LTE implementations. The term "multimode" or "multi-mode" is used to designate chips/devices that support multiple, disparate communication technologies (a device with WiFi and Bluetooth can be called multimode too, but we're talking only about cellular here. Plus, all of Apple's iDevices have had WiFi and Bluetooth in all models).

  • Only the GSM + CDMA + LTE models that support multiple carriers have the "MM" tag.
    Example: The 4th generation iPad and the iPad mini have models that support CDMA/GSM/LTE on Verizon and Sprint. So they're marked as "Cellular (MM)" to give them a more substantial (and carrier neutral) name.

  • The GSM + CDMA + LTE models in older generations that support only Verizon have a "VZ" tag instead of the "MM" tag.
    Example: The 3rd generation iPad, the first iPad to come with support for both CDMA and GSM on a single device, has a CDMA/GSM/LTE Verizon model, but it does not support Sprint. So it's marked as "Cellular (VZ)" to signify that it's tied to Verizon (and cannot work with another CDMA carrier like Sprint).

In Apple's current terminology:
"Cellular" implies GSM+LTE
"Cellular (MM)" implies GSM+CDMA+LTE (across CDMA carriers)

Note that there is no "CDMA only" version of the iPad after the iPad 2, unlike "GSM only" versions that have been and continue to be available.

You can come to similar conclusions by comparing the cellular support across iPad models/generations and how they relate to the chipsets used, the carriers supported, and their technology implementations.

Here are some links related to the iPad specs across generations and multi-mode (as it applies to cellular technology) that would help understand my conclusion better.

Technical specifications for iPads of different generations (pay attention to the technologies/carriers supported):
1. iPad (4th Generation) - Technical Specifications
2. iPad mini - Technical Specifications
2. iPad (3rd Generation) - Technical Specifications
3. iPad 2 - Technical Specifications

Links related to multi-mode (read them completely or search for "mode" to go to multimode related snippets on these pages):
1. Multi-band and multi-mode phones, Multi-mode and multi-band mobile phones
2. Cell phone bands and modes
3. Qualcomm Fifth Generation Gobi Platform
4. A rare look inside an LTE cell site
5. Sprint - multimodal hardware rollout
6. Intel previews multimode LTE chips

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I think it may be Mobility Management, which is a part of a cellular protocol. I'm not familiar with it, but here's the Wikipedia page. I'm an engineer dealing with cellular, so I'm actually gonna read this myself.

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    Great tip - +1 (I figure someone here will eventually nail down the acronym or we'll have entertaining guesses. Wither way, win!) That link makes MM look like part of a GSM spec, which could make sense to call it that over the CDMA version of iOS devices. – bmike Feb 23 '13 at 22:43
  • It's the CDMA and GSM (dual mode) devices that Apple calls as MM. So the MM that Apple uses cannot be a GSM specific aspect. – M K Sep 9 '13 at 8:19
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In the iPhone 6 lineup, Apple uses these two terminologies in its GSX tech support website:

MM: Multi-mode: i.e.: GSM + CDMA + FDD-LTE

MM-TD: Multi-mode: i.e.: GSM + CDMA + FDD-LTE + TD-LTE

EXAMPLES:

• IPHONE 6,MM-TD,128GB,GRAY A1586

• IPHONE 6,MM,128GB,GRAY A1549

FDD-LTE (Frequency Division LTE) is the LTE technology used most widely. TD-LTE (Time Division LTE) is now being implemented in countries such as China.

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The MM or Millenium Media according to what I can find, refers to the CDMA variation of the Cellular iPad for Verizon Networks.

The non MM version is for GSM carriers like AT&T.

Source:

https://discussions.apple.com/thread/5093889?start=0&tstart=0

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Millennial media. It is just a media platform.

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    Is there anything else you can add… ? – bmike Sep 6 '13 at 1:25
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According to this page:

http://support.apple.com/kb/ht5452#ipad4

the MM designation occurs on:

  • Model A1460: iPad (4th generation) Wi-Fi + Cellular (MM)

but not on:

  • Model A1459: iPad (4th generation) Wi-Fi + Cellular

And, according to this page:

http://support.apple.com/kb/sp662

the differences are as follows:

Model A1459

  • GSM/EDGE (850, 900, 1800, 1900 MHz)
  • UMTS/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz)
  • LTE (Bands 4 and 17)

Model A1460*

  • CDMA EV-DO Rev. A and Rev. B (800, 1900, 2100 MHz)
  • GSM/EDGE (850, 900, 1800, 1900 MHz)
  • UMTS/HSPA+/DC-HSDPA (850, 900, 1900, 2100 MHz)
  • LTE (Bands 1, 3, 5, 13, 25)
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4g available in This Model A /1460

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