How to disable LTE on a handset if calls are not going through

If your cell phone sees LTE but can't make or receive calls reliably, the LTE service from the Operator might be having an issue where you are located (this is not a Cel-Fi issue).  Try disabling LTE and see if call reliability improves.  You can always turn LTE back on, or even get an LTE ON/OFF widget App to simplify things. 

How to disable LTE:

iPhone users simply tap the “Settings” icon, then tap “Cellular”, then tap “Enable LTE” to move the slider button to the left (LTE disabled mode).   To re-enable LTE, simply tap “Enable LTE” to move the slider button to the right/green (LTE enabled mode).

Android users can download a “LTE 4G switch app” compatible with their device from the Google Play store; OR try Settings>More Networks>Mobile Networks to disable LTE; OR the user can perform the following manual steps for disabling/re-enabling LTE (instructions might differ slightly on different devices):

  1. Tap the “phone” icon to display the dialer window
  2. Dial *#*#4636#*#* on the phone; the phone display then opens the “Testing” options window.  Be careful not to change other settings in this menu!
  3. Tap the “Device information”  or "Phone Info" option; the phone then displays a long list of device settings
  4. Look under "Preferred Network Type" or Scroll down the list and tap the selection entitled “LTE/GSM auto (PRL)” to display cellular options
  5. Tap the “GSM/CDMA auto (PRL)” option to select it
  6. Tap the Android back-button 3 times to return back to the home screen
  7. “4G” or “3G” should now be displayed in the status bar at the top of the screen, indicating LTE cellular service is disabled.
  8. To re-enable LTE cellular service, reverse the process and select the service option that includes LTE.

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