When my iphone 7 plus is locked wifi is being disabled (not connected anymore) and thus unable to receive anything via internet.

That is completely normal if it's not connected to an external power source. When in standby and not connected to power, the WiFi radio will be powered down to conserve battery power. It should revert to using Cellular data when in standby.

Yes, I'm positive. It's been that way since 2007 and the original iPhone. Cellular data uses more power to actively transfer data than WiFi, but it takes much more power to maintain an idle WiFi connection than it does to maintain a connection to the cellular network. Don't bother wasting your time going to Apple. This can not be changed.

No, if you wish to have wi-fi to remain active, the device has to be connected to an external power source. Turning on Airplane mode turns off wi-fi, and even if you turn it back on again, it will still power down when the device goes to sleep.

IgorSerikava wrote:

Well, this is an annoying feature... Apple should put some options to disable this...

Thanks for all.

I don't see that happening, since it has been the other way since the introduction of the phone in 2007. Disabling the wi-fi radio helps reduce battery drain. As soon as the device is awakened, wi-fi reconnects. It will use cellular data for notifications, and then if within wi-fi range will immediately transfer to wi-fi as soon as it is awakened. As Tim asked, do you not have a cellular data plan? Notifications would only use a very small amount of data.

Yes, I do. The fact is that I used iPhone some years ago and I didn't remember doing this, than I changed for an Android phone where the WiFi keeps connected all the time and somehow I got used to it. Last month I bought the new iPhone and I thought it was an issue...

Hi

Go to settings down to reset Reset network settings

After reset enter your router wireless key .

Cheers

Brian

same with my iPhone 7... this is so annoying

did you solve this issue?

Are you sure? It doesn't make sense because the cellular data uses more battery than the WiFi.

I'm willing to go the closest Apple Store to see if they change my iPhone.

So if I want the WiFi stay connected I should turn on the Airplane Mode?

Yes, I got it. I tried with my iPhone connected to a PC and the WiFi stayed active.

Well, this is an annoying feature... Apple should put some options to disable this...

Thanks for all.

Why? Keeping WiFi active in standby would drastically reduce the standby time. Do you not have a cellular data plan?

Again, it is not an issue, and the device is operating correctly, just as designed.

Than you for solving my doubts. Appreciate your help.