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I have been receiving about 50 flash SMS a day, with my service provider name, from the number 50. As I read here, it might be a issue with activating and deactivating cell broadcast on the phone. However, I could not find the path suggested for the deactivation (Setting - Call - Other Call Settings). The option does not exist on this path. Any help?
Mobile: HTC Desire 816
Android Version: 4.4.2 with Sense 6.0
Try this
Settings - Call - Slot 1 call settings - GSM call settings - Cell Broadcast
Your problem is solved.
Remove your SIM and put it into any Nokia phone then go to Setting>Phone Setting>Cell info Display>Off.
Then put the SIM back in your HTC Desire 816.
I used Nokia X2-01 for this.
cell-broadcasttag, most of them asking how to turn it off, several for HTC devices. Have you checked them? With some luck, one of the variants works for you. If so, be welcome to answer your own question – otherwise, please edit it to indicate what you've tried and where you're stuck. Thanks!