That's it ! The reason for my questions was not to recover the flatrate L, but rather to understand what happened and to get the XL next time. With your generous help, I think I'm done. Thanks a lot.
If you allow, just one more question (though not directly related to the subject).
My another (local) stick is much better than Huawei E1550 (Sierra Compass 88
. Unfortunately, it is locked with the local provider, who refuses to unlock it even for a payment (well, I am in the Middle East). I can unlock it buying some third party software (e.g. dc-unlocker). The question is whether I will see a significant difference between the sticks while travelling in Germany (particularly in country sides). I mean drop-offs, speed, etc ?
P.S. I have no idea, why the smile appears above instead of 8 ???