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5G Broadband Drastic Speed Drop & Throttling to 120mbps after Settings Changed by customer service!

Mattyk66
Active

I have replied to other peoples posts multiple times about this but thought I would start another post as well to keep up the pressure on Three as they are refusing to admit they are throttling connections, yet multiple users have posted on the community site about this and stating they can now only hit 120mbps download when they used to hit much higher, these are different people in different parts of the country, being impacted exactly the same.  

I live right next to the 5G mast in my area, literally 30meters away. When I first went with three 5G broadband in October 2022 and up until November 2023, I was hitting anything from 600 to 900mbps download, all the time, even peak hours, I still have all the results recorded on my Ookla speed test app/account on my mobile phone.

In November, Disney plus stopped loading on my TV stating I was out of region, nothing I did/changed could get it to load so contacted three to see what was going on, they advised they could fix the issue by making some changes to my account settings and to restart my router and try and open Disney Plus again on my TV. Sure enough Disney loaded after the they messed with the settings, but from that exact point on (14/11/23) my download speed is stuck at 120mbps, won't go any higher. It jumps sometimes to around 400mbps when the speed test initially starts and then immediately and dramatically drops down to 120mbps with a second or two and stays there, clearly this is throttling and limiting the download speed. 

I contacted them on multiple occasions over the next few months and they were giving me all sorts of excuses and said they had changed settings and to try again, and another said they were working in the area but it would be back to normal in a month. I ran a speed test every week and nothing has changed, stuck on 120. I have had a month refunded and a month half price but all this time they are still claiming they do not limit the download speeds which is obviously absolute rubbish.

As someone else has mentioned on the community site, when I do a speed test on my phone when I am not connected to the Home broadband, and I'm also with three for my mobile contract, I still hit the usual 500mbps+ and nothing has changed with the speeds on my phone, just my broadband from November onwards. 

At the time I googled and couldn't find any posts on this so thought it was just an issue in my area, but after a speed test earlier, stuck on my 120, I googled and found this. Now I know this is happening to others I am going to contact them again and keep up the fight! Since I originally posted this only a month or so ago I can see there are new posts popping up weekly from people experiencing the exact same issue, so it seems to me Three and rolling out this download throttling across the country now. 

For those that want to leave three, due to the speed decreases, who are stuck in contract, they agreed with me that I could leave with no charges due to the change in service. When you first sign up, you get 14 days no quibble trial to see how it works and what speeds you get and you can send back if you not happy. So, if the speeds you are getting now, do not match the ones when you first got it, you can argue this and say you want to leave without a charge!

A further update to this - I made three send me out a brand new replacement router only 2 weeks ago at the start of Feb 24, so I could rule out that being an issue. I have a brand new replacement router (Zyxel NR5103), brand new sim card, and nothing changed. exactly the same and stuck at 120mbps. I have attached screenshots of speeds tests below and you can clearly see the moment they made the changes at their end on the 14/11/23, and from this point on my speed has been throttled to 120mbps, when the speed only 3 days before that was 544mbps.  I have also added screenshots of speed tests from Feb 2023, compared to speed tests from Feb 2024 and the differences are striking. My speed used to vary, as non throttled speeds should, between 400mbps up to 900mbps depending on the time of day/load on the network, as you would expect. Now, my download speeds have no variation at all, 7pm on Saturday evening at peak times, 120mpbs, 3am on a Sunday at the quietest time possible, still 120mbps. If speeds were not being throttled there would be a variation to the speeds I could hit. When I do the same speed tests on the Three mobile network when not connected to the home broadband, I get much quicker speeds, as previously mentioned, and I get the expected variation depending on the time of day. As I am about to post this, at 1:15am on a Sunday, I have ran a speed test on the 5G Mobile network and just hit 656mbps download, and then the speed test when connected to my home broadband, 119mbps, five and a half times slower!! Admittedly the upload speed was the opposite way around hitting 30.3mbps on mobile and 63.3mbps on the home broadband, but this again just shows that the speeds are being controlled and throttled. And again, I have attached the screenshot of this test below. 

I would like someone from Three technical support team to respond and finally admit that they are throttling speeds on the home broadband now, may be they are doing this as the network is getting busier as more people have joined over the last 12 months, but they need to admit this and stop the lies. 

 

Speed Test Results showing change in speeds on 14/11/23 immediately after Three changed the settings their end - 

Mattyk66_0-1708304117772.jpeg

 

Three Home Broadband Speed Test Results Feb 23

Mattyk66_1-1708304117793.jpeg

Three Home Broadband Speed Test Results Jan/Feb 24

Mattyk66_2-1708304117794.jpeg

Speed Test Comparison Three Mobile 5G to Three Home Broadband 5G

Mattyk66_3-1708305556613.png

 

 

59 REPLIES 59
JonathanB
Community Moderator
Community Moderator

Thanks @Mattyk66, and everyone who has been helping raise awareness about this issue.

We're confident that no one should be hitting a 120 Mbps limit now, but you may need to power off your router for a minute or two before using it, so that it fully disconnects and reconnects. If anyone is still finding this issue persists after that please let me know.

The only limitations that should apply are the inevitable ones associated with technology, coverage, and network capacity.



Mod tip! The author of a post can hit 'Accept as Solution', to highlight a reply that helped solved their query.


fashric
Active

It does indeed seem to be fixed. It does raise the question on how something like this can happen 'accidentally' also will Three be reimbursing people for the multiple hours wasted troubleshooting and talking to Three CS trying to explain what was happening and just hitting a brick wall time and time again and being told there was nothing wrong?

Mattyk66
Active

It's great they have fixed it. If I get any issues in the future, which hopefully I won't if they've fixed the issues, I will be coming on this forum and messaging the techs directly rather than attempting to speak to and contact the customer service

If I were you, I would go through to the Three complaints team, you can find them directly via the webchat if you search complaints. As soon as you speak to someone it automatically logs a complaint on record, and they will want to close the complaint. Explain what has happened and all the times you have called with the slow speeds getting nowhere and now Three have confirmed it was an issue their end all along and have fixed it. Say you're not happy it has taken this long etc...and I'm sure they will refund you some months rental. They did with me over the last few months. 

 

XLBully
Active

Agree - I have lost basically ~3 months+ via poor performance and inconvenience, and back and forth with the support. 

Mattyk66
Active

Hi @JonathanB - This is great news! Glad you have got to the bottom of it and this should have helped hundreds, possibly thousands of people around the country! Do I get some sort of commission out of this? 🤣

Matthew1471
Regular

So, if you are using the "3internet" APN and have the PDP type of "IPv4" set - then if your account has been migrated to "the new IPv6 network" (as in your SIM is set to connect to their new 5G mobile network core (MNC) data centre), then you will typically be limited to 120 Mbps.

There will be no Carrier Aggregation (ZTE shows this always as "No CA" irrespective of load) so I believe this is probably the limit from a single connection - there may not even be any deliberate limit beyond this technical limitation of a single 5G connection to the mast.

However if you switch to "IPv4v6" then your MTU will drop from 1380 to 1352 (due to the additional size of the IPv6 packet that encapsulates your IPv4 packet) and you will not get a public IPv4 address (instead the network performs DS-Lite so IPv4 packets get wrapped into IPv6) and more importantly 5G Carrier Aggregation will be active which will unlock significantly better speeds (depending on congestion).

Obviously having to infer a lot here but I wonder if the IPv4 PDP is just for legacy devices and devices which have compatibility issues with things such as CA. It's a pity that this seems to be the only way to get a public IPv4 address on Three. Could also just be a bottleneck of the 5G IPv6 MNC having to reach back into the 4G MNC SGSN/PGW/GGSN.

A lot of people get confused by the 192.0.0.2 address you get allocated, confusing it with the 192.168.x.x private network (RFC1918) range.. but this is the correct IP for DS-Lite (RFC6890) and outside the other private network range.

The IPv6 address I believe is public but I'm struggling to get DHCPv6-PD to work (perhaps ThreeUK don't support it). That's a different topic.

Would be great if someone at Three could explain why the speed difference? Is CA meant to be turned off by Three for the IPv4 PDP? or is CA enabled just not activating because there's no need for it due to sort of data centre IPv4 bottleneck when using the IPv4 PDP limiting everyone to 120 Mbps?

Are there any other ways to get Public IPv4 addresses (and IPv6?) exclusively using Three's network (i.e. Any other APNs)?

Matthew1471
Regular
Mattyk66
Active

Glad you're sorted now as well. Credit where it is due, @JonathanB and colleagues have fixed the issue and a reboot of router should fix the issue as you have confirmed

brooksdm2
Regular

Hi JonathanB

I still have some sort of capping / throttling to my download speeds. I get This has been sine the 2nd week in March

brooksdm2
Regular

Hi JonathanB,

I still have some sort of capping / throttling of downloads speeds. For the last 4 weeks or so I have been getting between 1.5 to 10mbps. Today has improved with around 50mbps which is OK, but I would normally get between 150 to 250mbps.

Spoke with the help desk on two occasions, they was no use, promised to fix the issue within seven days but I have received nothing, I have a case number INC300001592847

I've since check my speed with and without VPN see chart below, there is defiantly a configuration issue 3 network end or throttling, as you can see ping speed are faster via 3 network but download speed are reduced

Can you please check my account

Download speed.png