I just can report that I am observing the same behavior with a SIM from Telekom. The explanation that there are plenty of writes/reads to the SIM Card is also supported by the fact that the CPU of the fairphone gets rather hot, which might be due to the Loop of acceses to the SIM. My SIM Card is an C/W7 type. I switched now to slot 2 in the FP2 and it seams to work again - I will watch what happens and continue to report. Did you receive an C/T6 by Telekom in the meantime?
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Hi gosger,
no, it was my business SIM, so i have to organize the change with our IT department, that will need some more days.
The FP2 also gets hot without the Telekom SIM, so i am not sure if there is a connection.
You can use your SIM in the other slot? So it does not work in one of the 2 slots?
best regards,
thomas
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Hi Thomas,
apparently it seams to work in the other Slot for the Moment, but this is now only 4h, so let’s wait and see what happens…
best regards,
Klaus
Hi,
the SIM worked in the other Slot for 24 h - now it is dead, I will try and get a new one!
I have exactly the same problem with Telekom. FP2 killed the first SIM card then the next one worked fine for 2 weeks. Now it is killing that too - same symptoms as before… works after a reboot then fails. My vodafone.de card works just fine. This thread seems like an excellent description of the issue - did anyone get any response from Fairphone HQ?
Since I’m no sure if Fairphone are really aware of the problem, because it only affects users of some providers, I started investigating a bit about the problem.
In this article: http://alltech-reviews.de/oneplus-two-killt-telekom-sim-karten/ I found a statement of Telekom explaining the problem:
I already contacted Telekom and they told me the following: Their SIM cards use a feature called „MEC-Request“ (Mobile Equipment Change). Those requests contain things like activation, MMS-configuration, RDM-settings and more. The OnePlus cannot deal with these features and gives wrong feedback to the SIM card, so the SIM card tries it again and again, every 30 seconds, until the SIM cards memory flash cells break and the SIM becomes faulty. Here’s the German answer from Telekom: Gelöst: AW: Defekte Sim-Karte beim Oneplus One – Seite 2 | Telekom hilft Community
Affected providers:
- Deutsche Telekom
- Congstar
- Klarmobile and Callmobile (only older SIMs, now they use the Vodafone network)
- T-Mobile Austria
Affected SIM card types:
- C/W2 Hybrid
- C/W3 nano
- C/W7
SIM cards that seem NOT to be affected:
- V2 (Congstar, old)
- B/V2 (Congstar)
- C/V7 (Congstar, Deutsche Telekom)
- C/T6 (Deutsche Telekom)
- T-Mobile Austria say they have a compatible one, but I can’t find the version number
Other phones that are affected:
- OnePlus One, One Plus Two, One Plus X
- LG G2
- Oppo Find 7a and N1
- Xiaomi (Mi2S, Mi3 and Mi4)
- others reported in the Congstar forum: Nokia Lumia 630 Dual-Sim, ZTE KIS PLUS, Lenovo Yoga 10 hd+ Tablet, Samsung Galaxy -GT18150, ZTE OPEN C, Yotaphone 2, InFocus, LG E-400, Phicomm Energy M E550
I also found the info that there is an update for the Oneplus Two that contains ‘Ultra SIM compatibility improvement’, so maybe there is a possibilty that Fairphone can fix the problem with a software update.
Meanwhile, I would recommend the clients of the affected providers to insist on getting a compatible replacement SIM (C/V7 or better C/T6).
When Congstar started to send out the C/V7, the complaints in the forum stopped, so there’s hope. I got mine on 9th March and had no problem so far. 
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This is very interesting information, I wonder if Fairphone is aware about this issue.
Maybe we should bring this to the attention of @keesj as maybe no one from the Fairphone staff knows about this thread.
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No, i haven’t got any response from fairphone
Hi there, I have the same problem with a german O2 SIM card. I don’t know how to access the SIM type information, though.
I don’t think that it’s the same problem. SIM cards sometimes simply die… The problem with these Telekom cards is that they have this special feature “MEC-Request” which seems to be the root of the problem (see my post above). As far as I know, O2 doesn’t use this problematic feature.
In the case of the Telekom SIMs, the type name is normally printed on the card.
Is there a difference between C/W2 and C/W2 Hybrid? I recived my FP2 on 25 February. On one card is printed C/W2 and on the other one C/V7. Both are still working 
As far as I know, there’s no difference. The C/W2 is a hybrid mini/micro SIM. It’s well possible that yours will stop working in the nearer future. I got my FP2 on january 13th and the SIM died on march 7th. So it survived more or less two months. The days before it died it disconnected sometimes from the network and would only work again with a reboot.
Who’s your provider?
T-Mobile for both cards.
In order to get a better picture of how many people are affected, here’s a poll:
Providers
- Congstar
- Deutsche Telekom
- T-Mobile Austria
- Callmobile/Klarmobil
- Other
0 voters
SIM card types
- C/W2
- C/W3
- C/W7
- C/V7
- Don’t know
0 voters
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No reply form FP yet.
My dead card is B/W7, but I voted for C/W7 as best guess choice.
Best regards
Steffen
Well I thought my SIM-Card just died too. If it is a compatibility problem, some response from FP would be nice.
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Well, this is mainly a community forum, so don’t count on FP to reply here on any issues. If you want to get it contact with FP, you should contact support.
Okay, I will do so. Actually I thought this could be more convenient for them but FP seems to change communication strategy on many levels. Yesterday, I was very satisfied to find that FP announced monthly updates for FPOSOS and offers TWRP and Root now. No mentioning/advertising in this forum afaik from FP-Team.
I don’t want to bother the support with questions they possibly don’t have the answer to by themselves yet. They are under heavy customer-pressure and I will just wait.
Edit:
Meanwhile I found the announcement of the softwareteam 
I don’t know, but the symptoms are similar (up to now the increasing frequency of necessary reboots to find the card again). The Telekom quote does not claim that MEC requests are a Telekom invention, just that they make extensive use of it. Maybe other providers also use them. Just in case that other non-Telekom users will show up, my card is a 158 XW, whatever that means.
Same problem here. I have actually two SIM cards from T-Mobile Austria, an older one (1 year) and a rather new one (1 month). Unfortunately I don’t know (how to check) the type. The second one showed all the described symptoms and finally crossed over Jordan last weekend. Luckily getting a replacement was very uncomplicated. I don’t know if the new one is again of the problematic type. Let’s see…
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