By default, iMessages are already blue when sent and received on Apple devices such as iPhones, iPads, and Macs. If you are experiencing an issue where your iMessages are not showing up in blue, here are some possible solutions:
1. Check your iMessage settings: Go to Settings > Messages and make sure that the "Send as SMS" option is turned off and that the "iMessage" option is turned on. This will ensure that your messages are being sent as iMessages and will appear as blue.
2. Check your internet connection: iMessages require an internet connection to work properly. Make sure that your device is connected to Wi-Fi or cellular data.
3. Check the recipient’s device: iMessages will only show up as blue if the recipient is also using an Apple device with iMessage turned on. If the recipient is using a non-Apple device, or if they have iMessage turned off, your message will show up in green.
4. Update your device: Make sure your device is running the latest version of iOS, as older versions may have bugs that affect iMessage. As of 2023, the latest iOS version is iOS 16.
If none of these solutions work, you may need to contact Apple support for further assistance.