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Mar 20, 2015 12:00 PM in response to joaofromsanto tirsoby jeffd55,Hi João,
Thank you for using Apple Support Communities.
When you say "it constantly loses the connection to sim card", I understand that to mean the SIM card is not recognized and you get a "No SIM Card installed" alert. If that is the case, the following article provides troubleshooting steps for that issue.
If you see 'No SIM' alert on iPhone - Apple Support
Cheers,
Jeff D.
