1. Akram Shaari's Avatar
    I used to be able to change the network mode using the diagnosis app using WP 8.1.1 on developer preview. To do this I type *#0011# in the diagnosis app and then press back -> 1 -> 7 -> 2 and then select the network mode from here.

    However, I changed my phone csc to ATO to update to the latest firmware. Now, the diagnosis app does not work for me. Pressing the buttons in *#0011# part of the diagnosis app show no response.

    So, anyone knows how to change the network mode to force only 3G connection.
    06-23-2015 10:15 PM
  2. Matthew Becker1's Avatar
    You can change that in the phone's SIM settings.

    From Settings:
    "Mobile+SIM" (or "cellular+SIM")
    Scroll down, hit "SIM settings"
    Change "Highest connection speed" to 3G.
    07-13-2015 12:24 AM

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