Many modern Samsung phones struggle to lock onto a specific signal band. Technicians often need to lock a phone to 4G only for testing. SamFW Tool allows you to force bands via ADB or Dialer codes.
Version 4.2 expands compatibility dramatically: samfw-tool-v4.2
: Many critical functions require the device to be in "Test Mode," accessed by dialing in the emergency call dialer. Phonecheck Safety and Compliance Many modern Samsung phones struggle to lock onto