Hello Mychaela,
On Sat, Jul 22, 2017 at 1:47 AM, Mychaela Falconia mychaela.falconia@gmail.com wrote:
the only product I found so far is sysmoUSIM - if anyone else makes a similar product ("generic" SIM cards for tinkerers), I would like to know about it. In the case of sysmo(U)SIM cards, it looks like 2FF-only cards are no longer available, and the current choices are 2FF+3FF or 2FF+4FF. My question is: if I only want 2FF and have no interest in 3FF or 4FF, which variant should I buy?
I'm curious - since you're doing your own hardware, why not install a 3FF/4FF slot instead of a 2FF? Or even install two or three of them to give users a choice? I don't think you're really limited in space on your PCB, looking at it. But even with a 2FF slot, I'm surprised you have issues with mechanical strength - 3FF/4FF SIMs work fine with 2FF slots with an "adaptor", unless you plan to insert/remove them really frequently. And then, as Harald has mentioned, a small piece of a thin tape helps a lot.
PS We're also making / selling our own Fairwaves branded SIM cards, but only to customers who buy our BTS so far and we make them 2FF/3FF/4FF by default, as that's what most people want nowadays. So that's not much of a difference from what you get from Sysmocom.