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Yahoo mail's Windows Phone bug affects iPhone as well

updated 12:50 pm EST, Thu February 3, 2011

Yahoo said at fault for WP7 and iPhone mail bugs

A hunt late Wednesday has discovered that the Yahoo mail flaw behind inflated Windows Phone 7 data use also affects iPhone owners. Despite protestations from Yahoo, a test of its IMAP server with an iPhone returns the same overinflated response, which supplies about 25 times as much data as necessary. The hike spotted by Rafael Rivera could lead to those using Yahoo's push e-mail on the iPhone to accrue much more data use than they should if they receive enough messages.

In a statement, Yahoo had noted that other platforms, at first including iOS as well as Android, BlackBerry OS and Symbian, weren't subject to the same problem. It tried a quick fix at first and blamed Microsoft for using a non-standard method of connecting to Yahoo's servers. It's unclear if Microsoft was copying Apple's method or if any phone OS designer was responsible.

Whether or not Android encounters the same problem isn't clear, since the basic e-mail check doesn't show the unusual response.

The early search developer had been identified earlier as the source of the issues after Microsoft refused to identify it by name. Owners attacked Microsoft for leaving the problem a secret as it left them uncertain of what to do and potentially liable for large overage fees they couldn't avoid.

Neither Apple nor Yahoo has commented on the new findings, but any iOS user who notices a problem with a Yahoo account can either turn off cellular data or set the Yahoo account to fewer or manual-only checks.

by MacNN Staff



  1. leamanc

    Joined: Dec 1969


    Push only

    Something that seems to buried in this discussion is that you will only see this if you use Push for the Yahoo service. Push does require a lot more data back and forth, but not 25 times as much. But the point is, anyone experiencing this should just turn push off. Checking every 5 minutes keeps you pretty up-to-date and uses a lot less bandwidth (and battery life) than Push.

  1. Jabberwolf

    Joined: Dec 1969



    I've been saying this for the last 2 weeks!

    THANKS for posting the research - CHEERS TO ACTUAL TECH JOURNALISM!!!

  1. JuanGuapo

    Joined: Dec 1969


    Tested it.

    I just tested it on my iPhone… (Flickr)

    Conclusion: It works fine on iOS.

  1. nikstar101

    Joined: Dec 1969


    Not sure it is a problem

    Well i have been using Yahoo mail on my iPhone since i bought a 3G version in 2008 and my total download since then has been 3.5GB so i don't think Yahoo Mail has been sending huge amounts of data to my phone! As that works out at only 3.5MBs per day!

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