When is Quectel EC25 modem fully operational?

Which AT-cmd (or any other procedure) to use, to DEFINITELY determine that the Quectel EC25 is fully up, after a power cycle of the modem ?
I found out, that modem is not ready for use, when ttyUSBx shows up.

What do you mean with "ready to use"? What do you want the modem/module to do?

At any rate, I would expect AT+CSIM=?, AT+QINISTAT=? and AT+CSQ=? to be useful. This manual should prove useful for you.

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AT+QINISTAT to be checked is a good indicator, indeed.
Thank you.

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