Apple's mobile phone is too cold to read cards

Apple's mobile phone is too cold to read cards. The ideal temperature range of Apple mobile phone is between 16 degrees Celsius and 22 degrees Celsius. If the phone is turned off due to cold weather, this situation is only temporary, and its performance will return to normal when the battery temperature returns to the normal working range.

When the IPhone is cold, it shows that there is no SIM card.

Reinsert the SIM card. Maybe the SIM card has been loose for a long time. You can try to take out the SIM card and reinstall it, so you can insert it several times to see if the SIM card is in poor contact. If after several attempts, the Apple phone still prompts that the SIM card is not installed, you can restart the phone. Replace someone else's SIM card, check whether the SIM card is broken, restore the network settings, and then click Settings, General, Restore, and restore the network settings.

Turn on the airplane mode of iPhone, wait for ten seconds, turn it off, and then restart the phone. Take the card out with the card pick-up needle to see if there is any deviation, then adjust it and put it in to see how it works, and check the operator's settings update.