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March 2011 - Posts

Differences between Verizon CDMA iPhone and AT&T GSM iPhone

For those of you supporting a corporate enterprise environment where you now are starting to have to support both types of devices, Apple did post a knowledge base article on that specifically highlights the differences in use between the devices that may be useful for you:

It mostly impacts the following:
Call Fowarding
Call Waiting
Caller ID
Conference Call (how many you can call up, 5 on GSM, 2 on CDMA)
Pauses when dailing (the CDMA device doesn’t dial 1-800-MY-IPHONE or 555-1212x1234)
Hold (Doesn’t exist on CDMA)

Further details:

Of course all of this may change once we know more about the iPhone 5 and Verizon’s LTE plans into 2012..


Exchange ActiveSync (EAS) Policy Support on Mobile Devices

As the Microsoft Exchange platform has become the dominant e-mail solution of choice on the planet, it’s solution for remote e-mail access on mobile devices has also been the most widely used method. I will give some background, and then provide some links to information that may provide more in-depth information on the support given on various devices.


The EAS protocol, which has a server and a client component, was first licensed on the client side, and then later also in 3rd party server implementations.  In 2008 Microsoft announced it’s Interoperability Principles initiative and changed the licensing scheme to it’s EAS patents, and provided full documentation to the protocol to the public.

Today, the licensees include Apple, IBM, Google and probably most if not all the mobile device OEMs.  It is no secret that many believe that in part of the success of many of the other non-Microsoft mobile OS platforms has been their license of EAS and their successful implementations of it.


The important versions of EAS usually follow the Exchange Server releases and they are are currently:

EAS Version Server Release Comments
EAS 2.0 Exchange Server 2003  
EAS 2.5 Exchange Server 2003 SP2  
EAS 12 Exchange Server 2007 The Exchange software becomes part of Office release 12 aka Office 2007.
EAS 12.1 Exchange Server 2007 SP1  
EAS 14 Exchange Server 2010 The Office product team skips over number “13”.
EAS 14.1 Exchange Server 2010 SP1  

More details can be found here

Compatibility Comparisons

Due to the incremental versions, protocol licensing and various implementations on different mobile devices, OS platforms and software clients it is very hard to get a complete view of what features are supported on a given device.  Even if the mobile device is running a specific OS platform, the OEM, and mobile operator (especially here in North America) can decide to make specific changes.

I have found several references that may help, but all will obviously become out of date as new platform versions, software and devices come out.

I take no responsibility for their accuracy or the content. All information should always be tested on the devices you have on hand.  I also apologize if the links become dead after a given amount of time, please ping me and I can update.

Name Hyperlink Comment

Comparison of Exchange ActiveSync Clients


Updated by the “public” on Wikipedia, has Android 3.0.

Exchange ActiveSync Client Comparison Table

Link Updated table posted on Microsoft TechNet. Please notice the Nitrodesk Touchdown comparison. This can close many gaps on Android devices and also supported by MDM vendors.
Android and iPhone Exchange Activesync Policies Link Nice listing by Tom Basham in the UK. Points out some problems with the Wikipedia comparison on the CALs.
Android 2.2 and ActiveSync policies – a complete guide that works Link Only using a HTC Desire running Android 2.2 on Exchange 2007 SP1. But great play by play.
iPhone OS 4 and EAS – what really works? Link Only using an iPhone running iOS 4.2 on Exchange 2007 SP1. But another great play by play of all the policies.
More on Windows Phone 7 Security Policies Link Brief review from Tom Basham of the Windows Phone 7 related security policies.
Exchange ActiveSync Considerations When Using Windows Phone 7 Clients Link Detailed TechNet article on Windows Phone 7 supported features by Henrik Walther.