Time capsule stopped working with iphones, works with all other devices.

Hi guys,

I use my time caspsule as the wifi router down stairs. A few days ago the internet stopped working for both my wifes and my iphone. It works normally with all other devices, ipads, mac etc. I tried to reset the router with the reset button. Internet works on the phone when I connect to a different router upstairs.

The phones connect to the router, but internet either does not work, or work extremely slow. When I do the speed test from my ipad it shows the correct server (UAE) and a speed of 55mbit. When I do the speed test with my iphone, it shows the incorrect server, and shows one of the neighbouring countries, either Irak or Oman, and speed less then 1mbit. I tried to reset the network settings of my iphone as well. but no luck.

Do you have any idea what could casue the iphones stop working with the time capsule?