Problem with RG500Q-EA QENG command

I want to use QENG command with RG500Q-EA without sim card.

However whenever I type QENG command, it shows OK but nothing.

Can it cause because of no sim? or there is something other reason?

These are the log of mine.

AT+QENG=“servingcell”

OK
AT+QENG=“neighbourcell”

OK

Cheers!!

You could try doing a network scan first: AT+COPS=?

Be prepared for that command to take a minute or two to complete.

Thank you for your advice.
Unfortunately, there is no difference whether I run ’ AT+COPS=?’ first or not.

This is the log I’ve done.

AT+COPS=?

+COPS: (1,“KT”,“KT”,“45008”,7),(1,“LG U+”,“LG U+”,“45006”,7),(1,“KOR SK Telecom”,“SKT”,“45005”,7),(1,“450 30”,“450 30”,“45030”,7),(1,“KOR SK Telecom”,“SKT”,“45005”,2),(1,“KT”,“KT”,“45008”,2),(1,“450 12”,“450 12”,“45012”,7),(0-4),(0-2)

OK
AT+QENG=“servingcell”

OK
AT+QENG=“neighbourcell”

OK

Oh I found it out.

AT+QENG=“servingcell”

+QENG: “servingcell”,“LIMSRV”,“WCDMA”,450,05,2241,4820600,10737,313,1,-68,-2,-,-,-,-,-

Thank you so much!!

Dear Sir,

HQuectel_RG50xQ&RM5xxQ_Series_AT_Commands_Manual_V1.2.pdf (1.6 MB) ere is the AT command manual, hope it would be helpful for you.Thanks!

Above is the AT command manual, hope it would be helpful for you,thanks!