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So this is maybe (probably?) unrelated, but when touching down on an airplane, I always start getting push notifications even before joining the local WiFi etc.

by kevsim 6y ago

So this is maybe (probably?) unrelated, but when touching down on an airplane, I always start getting push notifications even before joining the local WiFi etc. What's going on there? Am I imagining this or does it actually happen?

philshem 6y ago
I often toggle mobile data on my phone when I'm away from WiFi, and I also noticed that even when mobile data is off, sometimes push notifications come through. It's hard to explain the conditions when it has happened, but it's uncanny when it happens.
battery423 6y ago
Out of airplane mode or not? If yes: yeah why not, perhaps your mobile network was able to get something in or you catched a wifi short term. If no: i would say no. But if you get an alert popup, it can be mechanism like mobile sending generic alerts for tornado and stuff
londons_explore 6y ago
Google and Apple push notification services are often whitelisted in WiFi networks so they work before you "sign in" to the network.
- kevsim 6y ago
  This sounds like the most reasonable explanation as I have data roaming off (and am always flying between countries)
- edwhitesell 6y ago
  (I work for a company that provides guest WiFi services in public spaces.) It's usually not that those specific services are whitelisted, but that a number of hostnames have to be whitelisted for the user experience. Sometimes, those hostnames include those types of services, depending on the phone, OS, carrier, etc.
lowwave 6y ago
I know for sure, push notification can come through airport wifi (the ones that you need to log in), even when you are not logged in. It may be something to do with notification via IP address instead of hostname. Can someone who has dived into the code on iOS/Darwin or Android/Linux kernel verify this?
noselasd 6y ago
You're maybe getting them through the mobile network instead of wifi ?
gdeglin 6y ago
These are probably local notifications https://developer.apple.com/documentation/usernotifications/scheduling_a_notification_locally_from_your_app https://developer.apple.com/documentation/usernotifications/...

by kevsim 6y ago

philshem 6y ago

I often toggle mobile data on my phone when I'm away from WiFi, and I also noticed that even when mobile data is off, sometimes push notifications come through. It's hard to explain the conditions when it has happened, but it's uncanny when it happens.

battery423 6y ago

Out of airplane mode or not? If yes: yeah why not, perhaps your mobile network was able to get something in or you catched a wifi short term. If no: i would say no. But if you get an alert popup, it can be mechanism like mobile sending generic alerts for tornado and stuff

londons_explore 6y ago

Google and Apple push notification services are often whitelisted in WiFi networks so they work before you "sign in" to the network.

kevsim 6y ago
This sounds like the most reasonable explanation as I have data roaming off (and am always flying between countries)
edwhitesell 6y ago
(I work for a company that provides guest WiFi services in public spaces.) It's usually not that those specific services are whitelisted, but that a number of hostnames have to be whitelisted for the user experience. Sometimes, those hostnames include those types of services, depending on the phone, OS, carrier, etc.

lowwave 6y ago

I know for sure, push notification can come through airport wifi (the ones that you need to log in), even when you are not logged in. It may be something to do with notification via IP address instead of hostname. Can someone who has dived into the code on iOS/Darwin or Android/Linux kernel verify this?

noselasd 6y ago

You're maybe getting them through the mobile network instead of wifi ?

gdeglin 6y ago

These are probably local notifications https://developer.apple.com/documentation/usernotifications/scheduling_a_notification_locally_from_your_app https://developer.apple.com/documentation/usernotifications/...