Hi @Fk2, I ask you to carry out this procedure without being connected to a wifi network: go to the phone settings, select the 2G network, if you have an iPhone select the 3G network. After selecting the network, type the following string on the phone's keyboard : ##21*1234# and press the green send button and then turn off the phone for 30 seconds and then turn it back on again. After turning the device back on, wait for 2G to appear and then switch the network back to 4G and check.
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