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Samsung Galaxy S7 edge

Troubleshooting

If your device isn't working properly, you can try several solutions to solve the problem.
In most cases you can solve the problem by following these guidelines:

If your mobile phone is SIM locked to Swisscom and you try to use a SIM card from another service provider, the display will tell you that your SIM card is invalid.

Solution: To use a SIM card from another service provider, you'll need to unlock your mobile phone. To unlock your mobile phone, certain conditions need to be met, this may not be free of charge.