@marYn: I know for a fact that 3607 wil work with this SIM Cards. Do you know, where can I find modified BIOS'es or HOWTO for doing it myself?
nothing as cool. The goverment agency, wich sells concessions for spectrum bands expects that Aero2 (part of Zygmunt's Solorz-Żak media empire) wich've buyed concession will give free-of-charge public internet access for three years after reaching 75% coverage with HSPA+ 900MHz and 50% coverage with LTE 2.6GHz.
Of course Aero2 doesn't wan't too much users - they limit bandwidth to 256kbps (512kbps in near future), list of modems, that work with specific configuration of this network is very short (not every HSPA+ 900MHz enabled device will work), the modems shoud be at least class 10 HSPA+ devices or class 3 TD-LTE devices.
There's 20PLN (about 4.5 EUR) caution for SIM card and the wait time about one month.
Detailed info is available here http://www.aero2.pl/bdi.html
HSPA+ coverageMay 2011(224kB) Prognosed for 30.12.2011 (15MB jpeg!!)
Oh, and LTE is virtually non existent.
They have 1.8GHz commercial LTE but very limited data packets (max 25GB/month)