My network keep switching from 4G to 3G even if I have good service
It started some weeks ago
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The simplest options are
1. Try a new sim card. Even though sim cards don't normally fail it is possible. Most post paid accounts offer free sim card replacement. Prepaid may require you buy a sim kit.
2. Try resetting network settings on the phone.
3. Possibly hardware issue with the charge port or antenna.
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