It just says “Vulcan 0502” below the serial number. No other information. Despite the age difference, it’s the same for both SIMs though…
It seems that the OnePlus devs have solved the issue (German link, translation by me):
@Douwe I think you should look into this.
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I’ll ask about this tomorrow. Thnx for the notification.
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Good news for clients of T-Mobile Austria:
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Hi Irina,
I had the same problems with my SIM card twice and now everything is okay with my C/T6 but for the second slot I got again a C/W7 and only usw it in an old Nokia mobile phone. This shouldn’t be the solution oft the problem. Until know I didn’t geht a solution from FP support but the notice that they habe lots oft requests to work out. My letter was Form April 17th:
Elmar Barthel
Apr 17, 10:54
I have big problems with my new FP2:
First everything was okay when I started in January 2016 with one SIM-card (prepaid from Telekom Deutschland). Some weeks later the SIM-card sign showed me: no connection, this occured especially when I came back from flight modus. I rebooted my FP2 and everything was okay again. But the problem occured more and more often although I put the SIM-card into the second slot to differ between a software or a SIM-card problem.
So I ordered another SIM-card from Telekom. I thought to have solved the problem.
Some weeks later I decided to put a second SIM-card (also Telekom Deutschland but by contract) into my FP2 because of getting more convenience during my daily work.
Now I had two new SIM-cards in my FP2.
Since 1 week the SIM-card in the first slot (contract SIM) has the same problem as written above, also when I change the slot, the prepaid SIM-card has normal connection.
But another problem appeared: When I want to phone and the FP2 askes me which SIM-card I want to choose for phoning, repeatedly there it won´t be possible to make the call: “Anruf nicht verfügbar”. The mobile connection is okay in both SIM-cards (can be seen at the sign on top right of the display).
This is very confusing and disturbing, and all the things happened yesterday at my work as doctor on call here in the region!! I wasn`t reachable for hours and I didn´t know about it!!
Finely it repeatedly also occured that when pressing the connecting SIM-card choice when making a phone call, the FP2 shut down for some second and then the display appeared again without claiming the security code of the SIM-card (so no real shut down).
Now I removed the second SIM-card, and until now (!!?) the FP2 works normally with one SIM-card (prepaid).
Remark: I did the new Update some days ago but the problems happened before.
What shall I do???
Regards
Dr. med. Elmar Barthel
As far as i understand you have 3 different problems.
Issue with T-Mobile SIM cards discussed in this topic.
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You couldn’t recive calls or you couldn’t make calls?
Take a look in this topics:
Take a look here:
You could have been found all that infos by yourself in the forum.
Hi Thomas,
now I got a new SIM card Type B/V7 from Telekom from which is written in a thread of OnePlus that it might be not killed. The problem is that you don’t habe influence on which kind of SIM you will get for substitution from the support.
I will inform you if it works or not…
EB
As far as I know, SIM cards with a “V” in the name are not affected. I think it’s important to insist on getting a new SIM card that works well for the OnePlus devices and to tell Telekom that the Fairphone is affected by the same problem.
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Any update on this topic? @Douwe wanted to ask about it? 
I have a C/W2 SIM card from congstar and my ordered Fairphone will hopefully be shipped or arrive next week - and I don’t want to order a new card if necessary.
As far as I know the problem is known at the dev team and being investigated.
For now @Irina_Spitznagel advice above seems the best route.
As soon as I know more I’ll post here.
Sorry for not having better news…
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Actually I think this is not a bug but expected behaviour. If you remove the battery, the FP has no way of advancing the timer, so inevitably the clock will be off the first time you start. As soon as the FP connects to a mobile network or the Internet though it should retrieve the proper time again. At least thats what my FP2 does after some time without power… 
Thank you for the quick response nevertheless
Affected cards will still last a few weeks if I followed this topic correctly. Maybe I just order a new card when my new phone arrives - according to congstar, all new cards do not have this problem.
My Congstar C/W2 survived about two months in the FP2. So maybe the Fairphone devs are quicker and you don’t even have to change your SIM (it’s more or less 15€). It didn’t die from one day to the other, the first disconnection problems started about one week earlier. At least if you call them, Congstar support is quite fast. I got the new SIM two days after my call.
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I have a Telekom V2 SIM card and have not experienced any problems after two weeks. Fingers crossed. Should any problem occur, I will report it here.
LTE contract no LTE (4G)I’ve got my new SIM today, unfortunately again a CW/7. My colleague from our IT department tried to convince T-Mobile to get a T6, but they didn’t. 
Fortunately i hold back my old moto G2 as a backup.
@Douwe: please give an update if there will be a fix available soon! Otherwise i will need to sell my FP2 and end this experiment.
Are you requesting a SIM card in Austria?
The Austrian Fairphoners are cooperating with T-Mobile Austria. If you like I can contact them for you and insist on a proper replacement SIM. It’s unfair if they don’t give out working SIM cards for FP2s (given that they also sell them themselves!).
No, it is a german T-Mobile SIM card. And it is a corporate card, so i’m limited to the will of the colleagues from our IT department, to discuss with the Deutsche Telekom guys. In addition there are so many other annoing bugs and issues in the FP2 hardware and software. That situation could be acceptable if there would be infos/announcements/feedback/plans or anything from fairphone.
Thanks for the info anyway.
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Yeah, unfortunately we do not have a commitment by Deutsche Telekom yet, to provide functional SIM cards…
I’ve got an answer from support which i want to share :
The SIM card issue is indeed a known issue we are currently working on and that should be fixed for the next software update. Our software team already has the fix and is looking for the best way to distribute it.
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