I have just received this email from TomTom so the models with SIM cards currently working may not work in the future if the owner doesn't renew Traffic updates is how I understand it.If you search on the internet there are still GPS with SIM cards available for sale
(example GO 5200 GO 6200 GO premium X)
"We would like to inform you that if TomTom Traffic is not renewed within 15 days, the support for the built-in SIM providing unlimited data will be discontinued.
Once the built-in SIM is deactivated it can not be re-activated, however you will be able to receive TomTom Traffic in the future by connecting your TomTom GO Professional 6200 to your smartphone via Bluetooth® wireless technology. You can find instructions on setting up your Bluetooth connection here."