Problem with SIM card on AiThinker A7 modem

Hi,
I’m trying to use Hologram SIM card on my project which uses an AiThinker A7 modem with a microsd card slot. I am located in Poland. Everything works as it should when I use SIM card from my local network. When I insert the Hologram card my modem does not seem to recognize it. AT+CCID returns error.

I use this socket for the SIM card. http://www.attend.com.tw/product_view.php?id=326.

Any idea on what is causing this behaviour? I am reading about USIM 1.8 vs SIM 3.3V sim cards. Does the Horizon supply the 1.8 or 3.3V version?

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