this post was submitted on 18 May 2025

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I travelled for total of 14 hours, didn't manage to convert my pSIM to eSIM, but I got to pet a cat (this makes senserule, I swear) (files.catbox.moe)

submitted 5 days ago* (last edited 5 days ago) by [email protected] to c/[email protected]

9 comments fedilink hide all child comments

TL;DR

I wanted to convert Czech SIM card to eSIM so I travelled to Czech Republic. I failed to do so there as well. ~600km both ways (373mi) (summed). I photographed some trains and pet a cat.

Introduction

So, ehm. I have very random interests, and now I just play around with SIM cards a bit.
So 6 months or so ago I bought Czech T-Mobile Twist IoT Standard SIM, just for fun. There were instructions on how to activate it from abroad, and it worked. Better yet, it can connect to 3 MNOs in Slovakia.

Cool. But I've advanced. I've found about these external eUICC chips like ThinkPad Thales. In the end I got 9esim V3. Also has STK profile switching.

I wanted to also convert that T-Mobile IoT card to eSIM, but failed to do so. Profile downloaded and installed just fine, but the SIM wouldn't connect. T-Mobile's website says it may not be possible to activate eSIM in Roaming in some cases, and to rather do so in Czech Republic.

Now, you see, I am a totally normal, sane and reasonable person. So I figured out my only option was to ~~give up~~ travel to Czech Republic.

Unfortunately I don't live near the borders, so this took a while.

Attempt and result

I arrived in Olomouc. If I were to get stuck somewhere, it better be some normal city rather than a small town or village.

I've had 2 of those SIMs to try 2 slightly different ways since I am not sure if it makes a difference.

I downloaded eSIM profile in Slovakia
I downloaded eSIM profile in Czech Republic

Neither worked.
Relevant screenshots:

Theories:

There's some difference between eSIM adapters and native eSIM that breaks functionality in this case
IoT cards can't be converted to eSIM. They are also sold as physical cards exclusively, but then why can I generate the activation code?

Other issues on the journey

My carrier 4ka barely ever managed to connect in roaming. It would take minutes to register at least in 2G which it would take again if it disconnected. It also wiped the correct APN which I had to manually add back. 4G it managed to connect to twice for a short time.
It also had issues registering in home network back in Slovakia. I had to switch it to 2G only first, and just then back to 4G in *#*#4636#*#* menu.

But anyway, my data plan doesn't have any data allowance in EU, just €0.014/MB.
So I just bought BNESIM.

I also had some issues with anxiety until I was finally on train to CR. I couldn't stop my leg, I was a bit shaky, and when I checked my HR was 117BPM while just sitting. Not that high, but still a bit too high for resting HR.
79BPM on the final train.

Photos

Also found this "vehicle for measuring of RF networks", but unfortunately it was locked away from me, so I just have this bad photo:

Cat

It was in the Púchov station back in SK. Just heard a loud meow when I was waiting for a train back home and walking around the station.

End

Not sure what to do now. I wanted my primary SIM as physical one in slot 1 and random eSIMs in slot 2, including this one. Crap.

top 9 comments

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[–] [email protected] 4 points 3 days ago (1 children)

So, i cannot see the images as they do not load for me because i've consumed all my mobile internet for the month by playing luanti :D

So i wanted to order a new SIM yesterday with a new tariff with unlimited internet, and i was thinking whether i should get eSIM.

So i did a bit of reading and found that eSIM is an integrated circuit (eUICC) with a software profile emulating a physical SIM.

I wonder, why do we need an integrated circuit for the eSIM? Why can't the CPU simulate the eSIM or the eUICC chip? Is it only for legal/regulatory reasons? Or is there a technical reason?

[–] [email protected] 1 points 3 days ago

Sorry. I do not know.

Possibly (theory) it's done that way mostly for legacy reasons. Probably why iSIM also exists, which is integrated into the processor.

Fun fact: Some eSIM only US iPhones can be converted to dual physical SIM with some effort.

[–] [email protected] 6 points 4 days ago (1 children)

Holy shit, cross border trains. Never seen that as an American.

[–] [email protected] 6 points 4 days ago (1 children)

FYI there's a New York to Toronto train as a partnersg between Amtrak and VIA Rail Canada.

[–] [email protected] 2 points 4 days ago

Ah that checks out, I'm a west coaster.

[–] [email protected] 7 points 4 days ago

kitty

[–] [email protected] 14 points 5 days ago

Cool trip nonetheless!

[–] [email protected] 27 points 5 days ago

I don't understand not even a bit of what you're saying, but nice trains, nice cat, and now I want to travel to Czechia too.

Cheers from Brazil

[–] [email protected] 41 points 5 days ago

thank you for respecting the cat's privacy by not showing the cat's face