You turn on Airplane Mode, then your wireless headphones keep playing. Has the setting failed? Not necessarily. The airplane icon is too little information to explain every connection the phone is using.
On iPhone, Wi-Fi and Bluetooth can be enabled separately while Airplane Mode remains on. Apple’s iOS 27 guide also notes that those choices may persist the next time you enter the mode. Do not assume that yesterday’s switch sequence will leave every connection in the same state today.
Give each connection its own check
Try this at home, at a time when temporarily losing calls or internet access will not matter. Note the iOS version first. Open Settings and inspect Wi-Fi, Bluetooth and mobile connectivity individually, rather than relying on the airplane symbol.
For a simple comparison, use a music track already downloaded to the phone. Listening through Bluetooth headphones tells you about the accessory connection; it does not show that the phone has internet access. An old web page still visible on screen is equally inconclusive.
Decide what you need before changing switches
Write down the intended result: for example, downloaded music through headphones, with no need to load anything online. Then compare that with the actual settings. If you need Wi-Fi, check which network is selected and test a new request rather than rereading a cached page.
Keep a note of the settings you changed and restore them afterwards. Different phone systems and versions may behave differently, so use instructions for your device. On an aircraft or at a venue with wireless restrictions, follow the operator’s instructions; this home check does not determine what use is permitted there.