Dual sim version
Will 5g work on dual sim version of iPhone 12.?
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If you have iPhone 12, iPhone 12 mini, iPhone 12 Pro, or iPhone 12 Pro Max, and both phone lines are active, 5G isn't available. To use 5G on these iPhone models, disable Dual SIM mode by turning off either one of your phone lines:
- Open the Settings app, then tap Cellular.
- Select the line that you want to turn off.
- Turn off the switch next to Turn On This Line.
Turn the line back on to return to Dual SIM mode.