Can't I send and receive text messages with my card meter?

See if you can't get all the news. If a number cannot be received, please check whether the information interception function (such as SMS blacklist) is set. If the prompt shows that the memory is full, please optimize the memory of the mobile phone (for example, delete some messages without knowing the information). If it fails, please turn off the phone, take out the SIM card and try to insert it again. I can't figure out how to update the version of the mobile phone system: Settings-(about the mobile phone/system update)-Manual download update/Automatic download update (software update/system update-update). Note: Please back up the data in the device before upgrading. If it is the latest version, please back up the data in your mobile phone and restore it to the factory.