If you try to send a standard SMS (Green Bubble) text while in Airplane Mode without a Wi-Fi connection, the message will fail immediately because your cellular radio is turned off. However, if you enable Wi-Fi while in Airplane Mode and connect to the plane's onboard network, your experience will depend on the app you use. iMessage (Blue Bubbles), WhatsApp, and Facebook Messenger will work perfectly because they use the internet rather than a cellular signal. In 2026, many airlines like Delta, United, and JetBlue offer free "Messaging Only" Wi-Fi tiers that specifically allow these internet-based apps to work at 35,000 feet. Standard SMS/MMS will still fail unless your carrier supports "Wi-Fi Calling/Texting" and you have that feature pre-activated. Essentially, your phone becomes a Wi-Fi-only device, so as long as you have an internet connection, you can stay in touch—just not through traditional cell towers.