So tell me how this will work. Will you swap SIM cards just to post anonymously sometimes and let the telecom providers (among others) find out what your other SIM cards are through your device ID? Or will you get a SIM card from another country to use exclusively and pay roaming costs / live with a worse data plan in Austria?

People apparently forget that telecoms providers cooperate with authorities, new legislation is planned for this too.

> So tell me how this will work. Will you swap SIM cards just to post anonymously sometimes and let the telecom providers (among others) find out what your other SIM cards are through your device ID? Or will you get a SIM card from another country to use exclusively and pay roaming costs / live with a worse data plan in Austria?

> People apparently forget that telecoms providers cooperate with authorities, new legislation is planned for this too.

Also remember that as soon as you connect to the cell phone network, your location is made known. If you ever slip up and use your personal and private sims in a more private place, you are likely to get caught. Coupled with other potential identifier leakage (like device id as you mentioned) the opsec bar is high for this use case.

Roaming costs are basically non-existant these days in the EU.

For me it is cheaper to use internet through roaming than buying local plan.

> Roaming costs are basically non-existant these days in the EU.

Data plans can be limited for other countries, even within the EU (and frequently are), i.e. if your prepaid contract allows 5GB monthly data transfer for free, the provider might limit this to 500MB for roaming and beyond that limit, you can pay a hefty fee per MB.

In general, prepaid cards aren't famous for having a generous data plan...

But in eu it's more like 20euros for 100go/month and 25go of roaming. The main problem is tje provider will close your account/ask you to pay more if you use roaming exclusively

Giffgaff in the UK gives you 20GB for £20 on pay as you go, and it can be used up to that limit anywhere in the EU. And you don't need a passport to get a simcard either.

> giffgaff runs on the O2 network

Eh, no thanks

You need almost no data to register an account.

You need passport or local id for prepaid purchase, at least in the EU countries to which I've been.

Czechia, Sweden, Finland, Ireland. There are more but plenty to pick from without registration and good prices.

I just bought a vodafone sim in the UK without ID. It is supposed to work all over Europe, but I only tried the Netherlands.

I cannot say for sure but as I remember EU countries eliminated roaming charges, even for prepaid. OTOH there are not so many EU countries that sell prepaid without ID.

"So tell me how this will work. Will you swap SIM cards just to post anonymously sometimes and let the telecom providers (among others) find out what your other SIM cards are through your device ID?"

Imagine connecting to the Internet using a non-phone ?

You use remote services that host your SIM card(s) for you. So you basically make VoIP calls that get routed to cellular networks.

How does your phone communicate with the "VoIP" provider?

You gotta use WiFi.

If it is like in Spain then the non-registered sim cards from other EU countries will simply not work if I remember correctly.

However I have heard that in Spain you could anyway buy unregistered sim cards from certain stores if you asked around and paid a bit more.

My non-registered Dutch t-mobile SIM worked fine in Spain a couple of weeks ago.

Sounds unlikely. I know quite many in Sweden who have unregistered SIM cards and I think I would have heard of if they did not work in Spain.

Alright then I am mistaken. But I do know for sure that you are required to show ID to get a sim card inside the country and there are no unregistered prepaid cards.