iPhone Running WiFi and Bluetooth simultaneously under iOS 13 causes major wifi download speed issues

[ckv_1860]

I accidentally realised I am facing WiFi download speed problems on my iPhone7+.

For sometime now my iPhone was slow when opening email, surfing the web, using instagram etc.- not all the time, occasionally. It would seem to struggle for a while and after sometime it would pick-up again.
Yesterday I was connected to a different network. I was trying to do some work and realised that my iPad was downloading fine over wifi while my iPhone was acting-up.
So I started running speed tests and realised that my iPhone was downloading at erratic speeds. One time it would download at max speed. After repeating the test a couple of times things started to become weird - the download speed would become erratic and, on occasion, drop even under 0,2Mbps. It would struggle a while and then sometimes the speed would pick up while others it would just keep on struggling.
At the same time my ALL other devices (iPads, MBP etc) were downloading at max speeds so it wasn't the router or the connection.
I have tried to reset network settings to no avail. I started a search and found that several people were experiencing the same problem - some with 6s, some with X, some with 11... They ones with 5GHz routers reported they solved their problem by switching to 5GHz - so, they claimed, the problem is with the 2.4GHz channels.

SOLUTION FOR MY PROBLEM:
Came across a post in Apple forums suggesting to deactivate Bluetooth and then trying again. MAGIC! Download speeds returned to normal. SHOCKING!
I am under the impression that it might have something to do with personal hotspots or Bluetooth issues that were widely reported (and that 13.2.3 is supposed to fix)

 

[IowaLynn]

I sometimes resort to airplane mode. I see threads regarding NT interference issues but usually other BT devices. Interference?

my WiFi can be extremely erratic. I blame ISP and touting issues. I can go from 240Mb to 10 at times. Weekends and 6am especially. Overnight service?

Turning WiFi off/on doesn’t help? At one point I bought newest modem and wifi6 router. That helped. The modem because two severe lightning storms very close by did something, not enough to totaled but damaged. Meaning those surge protectors and filters plus ground pole outside were overwhelmed - need replacing of course.

sometimes even lately a Speedtest would be unable to even connect. It has been... knock on wood... better the last two weeks.

Any currently supported router should have 2.4/5.0 and be getting firmware updates.

iPhone X does not support AX and 6 but iPhone 11 and Samsung S10+ do. iPad mini 5 seems to do okay but gets little use.

it is frustrating exasperated and no real solution or reason why.
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PS I think it mite likely not iOS 13.3 or 2.2 but iPhone and how well it’s supported

iOS is often messy until March or even April. Did trouble start with 13.0 in Sept?

 

[ckv_1860]

The problem is that phones are tools that need to work in the wild where equipment is more generic - it isn't reasonable to ask from the hotel - coffee shop - office to change routers just because my wifi connection is playing up...
Speaking for me, as I said, I observed the problem in my iPhone not my iPad. Again only the iPhone has bluetooth devices connected. And the problem is only in the download not the upload.
As I mentioned even people with X, XS, 11 are facing the same problem so I do not think it has to do with the phones but rather the software and the accessories.
Yes, the problems started shortly after I installed iOS13 but not sure which version...

 

[papbot]

I’ve not noticed this on any device. So far excellent download speeds, Bluetooth has always been on with various devices connected at various times. Could be a 13 issue, there are so many, but this is one I’ve not seen on our 5 devices.