Nice catch! I noticed this behavior for the first time on my FE and thought it was weird that I had to turn off wifi manually when turning on the hotspot. Why in the world would anyone need this for any valid reason? Other than some extremely unlikely cases, the only need I can see is to illicitly provide network access to devices that shouldn't be able to connect.
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This happens to me too sometimes and it turned out to be my router. My router was doing ad blocking and internet threat filtering. Initially when I turned those off for my phone in my router settings, everything was fine... then it started happening again. Turns out that is because the randomized mac feature of the S20 confuses the router when it comes to applying settings to individual devices. So my suggestion is look for any kind of filtering your router is doing, either to block ads or protect you from other online threats. Try turning that off for all devices. If it helps, turn off randomized mac addresses for your wifi network (touch the gear next to the network name, then touch advanced, then mac address type and change it to phone MAC) and then you can disable it just for your phone if you want.
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Are you using a 3rd party texting app? I have seen this when the other person is using RCS/Chat Features/Advanced Messaging (generic/Google Messages/Samsung Messages terminology for the same idea) but you are using a texting app that doesn't work with RCS. So the network is sending their texts as RCS but your texting app doesn't deal with them. Other people you text may have iPhones or otherwise non-RCS capable phones/carriers, so they just go regular SMS. In that case, switching to either Samsung Messages and turning on advanced messaging, or switching to google messages and turning on chat features should work. Alternately, go back to your old phone and turn off advanced messages/chat features so that the network knows to only send you SMS. You might have to do that if neither Samsung Messages nor Google Messages works with rcs (for me on my AT&T FE, that was my situation until a couple weeks ago when a carrier services update made Google Messages start working with RCS).
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Does this happen to you only when connected to a certain wifi network? This is what happens to me often at home, and it seems to be related to some flaky ad-blocking/threat protection my router tries to do. Disconnecting from my wifi lets me download the message. (more detail: I have plume wifi and I think the randomized mac setting makes the default ad-blocking/threat protection enabled, even though I have it set to be turned off. I just realized this is probably why the plume app started acting odd in other ways at the time I got my S20FE so I have just turned randomized mac addresses off for my home network.)
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I would like this too. Especially with the in-screen fingerprint reader, where you really want to remove your finger as soon as the screen unlocks. I set Tasker up to do this, which is better than nothing, but there is a fraction of a second delay that wouldn't be there if it were built-in.
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For me this seems to be caused by my wifi blocking access to AT&T's servers. If I disconnect from wifi I am able to download it.Seems to be some flaky ad blocking on the Plume wifi.
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