just wanted to advise to anyone who is thinking about which way to go ...
DO NOT repeat my mistake!
Instead of trying to get some locked modem, unlocking it, and using with another sim card ...
why not to add an extra 20-25 and to get a proper modem (fully unlocked) with a much better reception and to use it with any provider you like?
For example, this one
Solwise LP1917E 3G USB Modem w/ External Antenna (Unlocked) NET-3G-LP1917E
Unlocking might work, or might not. It highly depends on the model, manufacturer, etc, etc, etc
inquisitor,
do not take it personally, ok?
[ update : instead of playing with ZTE i found some Hauwei modem (thanks to my colleague who gave me some tchibo modem and trying to use your link above. The model is not mentioned in the description (E173), however unlocked code is generated by the online script. Will try it tonight. Thanks. ]
[ if it would not work then - *** it, i'll get a proper unlocked modem ]