How can I send a text message if I lose my iphone?

Sign in to another Apple device now, use your APPLEID and find myiphone to find it. If the lost mobile phone is turned on and connected to the Internet, it should be able to locate it. There is still a chance to get it back. Mobile phone information and phone calls should be backed up. If there is a backup to the cloud, such as ICLOUD or Synchronization Assistant, you can retrieve the backed-up data by downloading it to a new device. It's best to download an iTunes on your computer, and back up important information to icloud through iTunes. When the new device is synchronized, you can also retrieve the backed-up information. Be sure to get into the habit of backing up important information.