Open the “Settings” app on your iPhone. Scroll down and tap on “Cellular” or “Mobile Data”, depending on your device’s settings. Look for the “Cellular Data Options” or “Mobile Data Options” menu and select it. Tap on “Voice & Data” or “Enable LTE”. Choose the option that includes “4G” or “LTE”. Now, waitIn there, if there's an option, select phone information, then lock the RAT to 4G only. Alternatively, if *#2263# or *#2683662# is available, in *#0011# select the other SIM if there is any, then in those other codes, band selection, GSM ALL (for the unused SIM), change SIM again with *#0011#, band selection, LTE ALL(for the used SIM). The Samsung Galaxy series, can read QR codes without installing any additional software. There a few easy ways to decode QR Codes, with Bixby Vision and Samsung Internet or Samsung Internet (Beta) and through the Camera app simply point your camera at the code and instantly be redirected to URLs links, Geo Co-ordinates, contact information or
1. Perform a Hard Reboot. If your Samsung phone appears stuck in Airplane Mode and if it’s not responding, you can start by performing a hard reboot. Don’t worry, this will not affect your personal data. To hard reboot your Samsung phone, press and hold the Power button and the Volume Down button simultaneously for more than 7 seconds.