Workaround from @unknown: Install
[media]and manually enable "Use Cellular Data" in Settings > Profile.
In Minecraft Bedrock Edition, you have to open "Enable mobile data" in settings so that you can join the server with cellular network connections. But there is no such option in Windows 10 PC, so I couldn't join the server while LTE is turning on in my laptop.
So could you please make the "Enable mobile data" option available in Windows 10?
[media]Linked issues
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I have uploaded a pack that simply shows the toggle, please check if enabling it allows mobile data connection.

Skajjie, This pack worked!! Thank you. I didn't realize at first that I needed to activate it, but now it's working perfectly.
Thank you very much for following through on this.

Skaijie, appreciate the work out, it works, thank you!

I wonder how Minecraft is even able to know the type of connection of my PC... I think that if Mojang has anticipated the cellular data on PC, they should have done it completely and correctly since the beginning.
Where can I find @Skaijie 's pack to make th toggle appear?

Simply click the blue link and it should download automatically.
On a side ntoe, it is listed as "MAY NOT WORK" when you look at the pack description because I wasn't sure if the only issue was the toggle. Others have since confirmed that enabling the toggle works.

@Kaijie
I don't see any link on this page, am I looking in the wrong place ?

Click the blue text:
[media]
If you somehow still can't click it, download it from the attachments or use this:

Thank you so much @Skaijie, it worked !
Is correcting that as easy as I think ? Because I don't see why Mojang didn't do this...

Fixing a problem in the most direct or obvious way is often unwise. Take the situation where you've blown a fuse in your home's electrical panel and don't have a spare one with the right capacity. You can put a larger capacity fuse in its place, and that will make your lights come back on, but it will also put you at risk of burning down your house if you turn on too many electrical devices at one time.
We don't know why Mojang doesn't fix your problem this way, but it's plausible that at the time they were designing Bedrock there weren't any devices that were able to run Win 10 and use LTE data, so the question of whether they should implement it never came up. And now that it's a valid question, it needs to be studied so that while making it easy for you to connect on the go, they don't simultaneously make it easy for hackers to steal your personal information though an LTE exploit nobody thought of.

@Skaijie
I clicked, it downloaded. I opened it, it installed. I have no toggle. What am I doing wrong? 🤣

Did you activate the pack under Settings > Global Resources?

No.. I did not. And that was the problem.
That worked! 🤣 sorry I'm old!

i came up this issue when purchased bitt older ThinkPad with LTE
In older versions I remember that there was mobile data toggle, I don't know why they always remove that is working. I remember when it first came out it was MCPE but on PC
I have ordered a stationary PC with LTE, because of my operator that gives me multiple LTE sim cards for internet Witch I cant only use on MCBE for online multiplayer

@Skaijie I was able to download, import and enable the work-around resource pack on 1.19.51.
However, neither did the toggle show up anywhere in settings (where exactly?), nor did it fix the issue.
In fact, running Minecraft on my Snapdragon SQ3 (Surface Pro 9) with this pack enabled causes it to bugcheck after about a minute!?
Any other workaround possible? Or progress on fixing the root cause?
I'd REQUEST: Just don't check for cellular or WiFi at all. If the device is online, just work.
(btw. my cellular is NOT "metered")

It almost looks like Mojang/Microsoft is not aware of the existence of existence of cellular dongle or that some PCs embarks 4G or 5G modems...
Event though Microsoft included the support of such hardware in Windows, there is even : a setting to set it to metered for the case it should be used the less possible.
I tried to comment this ticket [MCPE-55405] Get "You must be connected to wifi to play with your friends". - Jira (mojang.com) maybe they will re-open it to fix it.

@Skaijie I tried to install your mod on a new PC but it does not make the toggle appear anymore, but on my previous PC it still worked. Because it was only with the new install, and that it worked until my last PC has been made redundant, I can't tell from which version this appeared.
I have seen that, at least in the french GUI, the menu has been renamed "account" instead of "profile" maybe it is a lead.

I've attached an updated version of the resource pack. Please check if it works for you. The toggle should be under Settings > General.
[media]
I have this same issue..
When attempting to connect to friends or realms while connected to LTE data an error stating that "You must be connected to WIFI to play with your friends." This only happens on LTE. I have set the connection to be "not metered" and it still does not work.
Steps:
Disconnect from wifi and/or ethernet.
Connect to LTE/cellular service.
Launch Minecraft Windows 10 edition.
Attempt to connect to friends or Realm.
Observed Results:
Pop up dialog stating "You must be connected to WIFI to play with friends"
Fails to connect.
Expected Results:
Connect to server and friends as is typical when using Cellular on a mobile device.
Screen Captures:
[media]Windows 10: No option to enable cellular data.
[media]Android: Option enabling cellular data.
[media]LTE not set to metered.
[media]Notes:
As noted in the original post there is no option within the Windows 10 version of Minecraft to allow for play over cellular data like there is on the mobile counterparts. This would be very handy to allow those with an LTE enabled laptop/tablet to play while on the go.