I have a 12GB sim and have only used 500mb since I started using it to test it worked in May.
On Saturday when I did need it it didn't work in the TP-Link Mobile Wifi so I contacted them through Amazon where I bought it.
They really are being very helpful, but its still not working. I have now put it in a different device, 4G Huawei play and it still doesn't work.
Three are asking me :-
Can you enter these APN settings in your Wifi device:
1. Reset your APN to default and ensure data roaming is ON
2. Update the APN settings:
APN Name: 3
Username: three.co.uk
Password: blank

I haven't got a clue what this means, but I have used Polish and Czeck SIM cards in this device without problem, why would I need to go through this palaver?
Your help would be much appreciated,
Orange at Christmas, that sort of thing

When did you get it Jan? Its not a two month thing thats expired or something is it? maybe you should try contacting three themselves if that is possible.

Was it purchased in Germany or has it come from the UK as there was a limit I believe on some of these sims of two months roaming out of the country it was bought in but Im no expert as I dont use them. Just what I have picked up on.

For those settings I think you will need to login to the Mifi menu on a browser by putting in the IP address at the top of the browser (Safari / google chrome etc) probably something like 192.168.1.1. There will be something in the manual probably but I suspect your right, I bet its not that. I think its maybe been blocked or expired. As its not in a phone you wouldnt get any notification. Call "3".

Did you register it on the 3 website Jan?

If not, you could do that now.

I can see I've loads of data but it doesn't seem to be working very well recently - maybe I've been away too long. Certainly the giffgaff (in the phone) allows me 63 days I think before they start charging me - they charge less if I have a current goodybag but still charge.

Is it one of the 12gb for 12 months sims. Can you use it in the original device.

I'm almost sure that the 12gb sims have a time limit on usage abroad...........if it first logged usage in May then that will have set the clock ticking no matter that you did not use any data...................it then needs to be used in UK to reset.

Otherwise log on a Barry said and try to work out the settings as you describe.................the 3 contact centre are usually very helpful.

Actually rethinking..............if first used in May it should still be valid in June..................log on and try to change the settings

I have just come off the phone 1 hour 40 mins, their call not mine, Ahmed was trying his hardest to help me, we have been everywhere both on the Kindle and on Safari, sim in the TP-Link and then the Huawei devices, but the correct window will not come up on these http://198 etc. He checked for coverages in this area, 3-4 G. The device has been reset, but still nothing.
He advised me to send it back for a refund. Very strange how it worked well for 500mb when I was testing it in a few places when we were out and about, when I really wanted it buddy fing didn't work.

Ahmed spoke excellent English, there was only a very slight accent that I thought was South African, but his family come from Bangladesh, not sure if he has ever even been there.

Its 12 GB by the way and doesn't expire until next May if I don't use up all 12 GB.

Hi Jan I could talk you through it (when I'm sober tomorrow) but possibly the easiest thing is to reset your mifi. There will be a hole somewhere to insert a pin or the end of a paper clip. Maybe have to take the battery out. Hold it in for a few seconds, when it reboots it should pick up the details from your Sim card. Good luck

Dick

We did reset it Dick, but still didn't work.

Have you any messages Jan?

Oops sorry Jan didn't realize you had it in a phone/tablet. If you bought it as a data sim maybe you need to put it in a mifi.

They won't connect it in a phone, even if it's a dual sim phone and you only wnat that sim for data. God knows why.

I bought one on Amazon a year or so ago and 3 simply refused to connect it because they said the imei told them it was in a phone.

Weird or what? I can find the thread if you'd like me to. Put it in a mifi or an ipad and I expect it might work.