Do I need a new SIM card if I have use a 4G portable WiFi device?

[gregsonsteel]

I have an unlimited data plan with EE, and recently bought a 4G portable WiFi device to run my tablet from..But, though it connects and shows a strong signal (but not on the 4G portable itself) it won't connect to the internet. As the SIM is now a few years old, would I need a new compatible one,and if so how much extra per month would that cost? Many thanks for reading

[XRaySpeX]

@gregsonsteel : Didn't your mobile router come with a SIM? If so, are you using that?

Where are you using your unlimited data SIM? In a phone or in the router? Is it on contract or PAYG?

[gregsonsteel]

Hello and thank you for replying. 

The unlimited data SIM is always used in a little portable pocket router, and I'm on a contract.

The 4G one I'm having no joy at all with  has a 3 logo 

And just to be specific, the 4G  router was purchased reconditioned from Amazon and came with an O2 SIM card, but having said that it was described as unlocked in the item's description.

This, and I don't know if it's a connected problem or not, comes at a time when my internet speed on the old pocket router I'm currently using is exceptionally slow, less than 1Mbps

Thanks again 

[gregsonsteel]

Oh yes I forgot to add, it looks as though my contract also includes 5G!

[XRaySpeX]

So the 4G router has nowt to do with EE? It came from 3 but has an O2 SIM in it but you don't know if it ever worked in that configuration? I can't see how we can help with that. It's not even trying to use the EE network.

If it's unlocked as claimed, you could try your EE unlimited data SIM in it or get a PAYG SIM from EE.