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Brand new thingy91 is unable to attach to the network

hello,

I got today thingy91 and tried to play with it, but it seems that there is some issue (probably, with network/SIM?)

SIM card is from iBasis (card is activated successfuly), but device blinks ~5 hours with blue light and it is still impossible to add it to the cloud.

As the Nordic ecosystem is new for me, I read carefully a lot of how-tos and performed the following steps:

- downloaded latest pre-compiled binary FW files;

- downloaded new certification files;

- flashed thingy91_at_client_v0.2.3.bin;

- updated certificate using LTE Link Monitor (successfully)

- flashed thingy91_nbiot_legacy_pco_v0.2.2.bin

As I mentioned, device still trying to attach to the network (I see multiple +CEREG 2 messages in terminal, only once I saw +CEREG 4 with some cell id).

Is there some step-by-step guide which I can follow to detect the reason for the issue?

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