What it does may not match the regulation in any particular geography as rules vary. You can choose to turn it off anytime in violation of the rules, so there is no difference there. "Airplane mode" is a convenience feature provided by the phone manufacturer. What is the point of disabling Bluetooth and WLAN if you're not prohibited from turning them on again? What is the point of even having airplane mode on devices that don't support mobile data in the first place? It doesn't actually do anything (but is presumably still required). At that point, airplane mode is just a pretty little icon that appears in your device's status bar. In most cases, you can turn both antennas back on after enabling airplane mode. the Nintendo Switch, most smart watches, and probably a truckload of other non-phone devices). I own multiple devices which only have Bluetooth and/or WLAN antennas (e.g. The obvious interpretation is that you can do whatever you want as long as your device is in airplane mode ("They said to put everything in airplane mode, and I did, so I complied with their instructions."). At the same time, most airlines clearly want you to turn on WLAN so that they can sell you internet access. "WLAN is fine, but keep Bluetooth off" or similar). During the safety briefing of every flight I remember in the recent past, they would say something along the lines of "You can use electronic devices as long as they're in airplane mode," or very rarely, "You need to switch your electronic devices completely off until we hit 10k feet, and then use them in airplane mode." But they don't tell you anything more specific in the safety briefing or on the information card (e.g. Asking the airline, as suggested in this answer, is useless. However, I can turn WLAN and Bluetooth back on again without disabling airplane mode. In particular, it disables mobile data (4G/LTE, or whatever it has roamed onto), WLAN (WiFi), and Bluetooth.
On my (Android) phone, enabling airplane mode automatically disables all wireless antennas except for GPS and NFC (I assume the latter is either passive or way too low power for anyone to care about).
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