E7 1 Unable to send SMS.

Your mobile phone is a Saipan smart phone, not a mobile custom machine. . The standby state indicates that the memory of the mobile phone is insufficient. Instead of files, the memory is used, but some programs are running, which occupies the memory of the mobile phone. . Just shut down and restart. As for the long-term solution. Try not to download too much software and close unnecessary programs. . Regularly clean up the junk files in the mobile phone folder. . You can also brush the machine back to the ordinary machine and remove the mobile phone application. . I hope my answer can help you. . -