Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.


macrumors newbie
Original poster
Feb 15, 2013

I have searched everywhere for a solution and would like to attempt to diagnose this issue first before replacing my wife's iPhone 5. A few people from random Google searches have had this problem, but no solution was found.

Problem: When iPhone 5 is connected to home network, Wifi speed slows DRAMATICALLY. I have already determined her phone is the source of the problem. I have 5 other devices connected and have turned them all off/on separately and the iPhone 5 is the only one that slows down the connection. Right now, I have 5 devices total connected to my wifi and my speed is normal. Her phone has wifi turned off.

  • Motorola SBG6580 (Modem/Router) Router turned off.
  • Linksys N900 Router
  • iPhone 5 32GB iOS 6.1 (Been having problem since she got the phone with iOS 6)

I have tried:
  • Turning modem/router on/off several times
  • Rebooting her phone several times
  • Restoring her phone
  • Turning on guest network and connecting only her phone to it
  • Directly connecting PC to router

I would appreciate any and all suggestions, sans calling my ISP and Apple, as I have already done this in the past.

Thank you in advance!
Last edited:


macrumors 6502a
Oct 24, 2008
This sounds like the most basic and redundant response but have you had the phone replaced yet?

Also, is the device jail broken?

I would next try updating/restoring the firmware on the router.


macrumors 65816
Oct 4, 2011
I would next try updating/restoring the firmware on the router.

^^ This. And I would go grab another router from Best Buy or an Apple Store and see if you have the same results. You can always return the router if there is no change. But it would certainly take the router out of the equation and streamline your troubleshooting.


macrumors newbie
Apr 18, 2015
I have the exact same issue. Running an asus router. When i am playing my wii online (smash bros), my girlfriend can turn the whole game to slow motion just by activating wifi on here iphone 5. She turns it off, and the game returns to normal speed. It also effect both our computers which are wired to the router.


macrumors regular
Mar 25, 2008
That issue drove me crazy. Anyways:

1. Reset network settings.

2. Set Flight mode ON then turn off your iPhone.

3. Go to your router's web page, change your Wi-Fi network name and password.

4. Flight mode OFF - Connect to your new Wi-Fi - Test the connection.

That worked for me :)
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.