Apple Watch Impossible to Pair with Three

[Nadeem1]

For the past 2 days I've been bounced around Three's Support Network with no solution to a somewhat simple issue. It seems like the "Technical Support" team and even the "Senior Technical Support" team have no clue as to how to fix an Apple Watch Network Pairing issue. Instead of helping with getting the watch's cellular working they started reading me Settings to change on my iPhone which are completely unrelated to my watch. I have had to unpair/factory reset my watch about 5 times as apparently that will fix the issue. Now to the issue at question:

When activating the cellular service on my Apple Watch, I cannot get past the login page as I keep getting "There's a problem, At least one of the fields is wrong" even though all the fields are filled and correct. I have been stuck at this for ages and for sometimes I get through to the "Our Plan" page which says that "You've already purchased this plan" and asks me to "Activate Now". After clicking this button, it sends me to another error "There's a problem, System Error." 

Now it's a shame that there is no support the "Technical Support" team can give to a growing group of users who use smart watches and want to connect to Three. If a company is charging £7 to pair cellular service to a smart watch then it should work seamlessly and have a support sector who can help if needed. I think the infrastructure should be built out, tested on and validated before it is allowed to be used by consumers. If a service can't handle a watch unpairing because the IMEI's are the same (as I have read in other forum posts) then that service isn't ready to be released, let alone ask users to pay for it.

If someone can help me get this sorted, please can you reach out as I am considering changing providers.

[kenzo]

I'm writing this in 2025, I've just bought an apple watch cellular and have come across the same issue that you were  experiencing in 2023. Seems like Three aren't bothered enough to ever fix the issue. So I'm returning the watch, especially when it cost £100 extra just to have the functionality. 

[Ineedhelp]

I struggled with this. Spent hours + support didnt manage either. I changed my Three password to only letters &  dropped all numbers so letters only and signed out.
I then Power cycled my I-phone then back into the Watch App and it looks to have worked ok

[patrickcondy]

IM having the same issue as you all -  Im extremly annoyed as i describe my issue then i have four or five diffrent calls with diffrent teams and then i get a call back set up from a tech team.

Then that tech team call me back and ghost me on the phone.

I have the recordings of this!

They do not solve my issue and then close the ticket to try and avoid the issue !

I have spoken with a lawyer and he is advising to take legal action to void the contract and move supplies.

My issue: When i try to set up mobile data on my apple watch ultra it connects to a three screen and then displays the following. "There is a problem. Please note that you cant progress to a new subscriton as you already have an existing one which is still in progress" now as i mentioned i have been through this before.

So things i have checked:

My iphone and watch are up to date

i have rest the watch muitle times i have rest the watch mobile data multipe times.

i do not have any other add ons that i can see on my end

I have rest my passwords and they done have any upper case or special characters

I have waited more than one billing cycle

i have paried an unpared i have cleared web browser settings

so what else can i try

[Threesydoesit]

Same here spent hours on pointless live chat following instruction that only made the matter worse. Reset repaired and now no network connection at all. I demanded a call with technical which was just as pointless. Wasted over two hours to be told go and visit a three store. Which I’m unable to do for a week. The systems on this network reflect the cheap prices I suppose. Time to move the EE!

[Has1]

Exactly the same issue I’m having. The operators on the chat facility haven’t got a clue.  After all what can you do if the product you’re responsible for just isn’t working properly. 

I’ve tried re-installing watch and iPhone.  They don’t have a record of the subscription so can’t cancel it so I can try again. 

[thutchings]

Hi,

I managed to fix this by changing my password to only included upper and lower case letters.  Removed any numbers/special characters.  Once I did that, it worked.  Now just waiting for the activation to happen.

Cheers

Tom.

[marsmontblanc]

Hi. I had exactly the same problem with adding mobile/cellular to an AW 7 (login page said one of the fields was missing when they weren’t). Only thing that worked for me was to change my three password and then wait for their systems to update overnight. Tried again this morning and it worked without any issue. Weird because I had no problem at all adding cellular to an AW Ultra three months ago. 

[Damianartherton]

Any luck with this I have the same issue 

[Bearspike]

Hi there after 3 days of going around in circles with Three Support, Technical and Complaint Teams. 
the following worked for me after reading it on here.

go into general and clear data within safari, browser history/ data etc.

turn off phone and watch and reboot.

go to watch app and click on mobile service and enter email account and password.

i kept my password just upper and lower and numerical characters only.

i was then able to progress to choosing add on and accepting the updated plan.

hope this helps.