How to check, if my ASUS Nexus 7 LTE really is LTE version? Following this question and my many further tests, I begin to fear, that my ASUS Nexus 7 II (2013) LTE isn't actually a LTE version and I simply has been cheated, paying for LTE version and getting 3G one.

What is the best way to check / prove, that this device really is LTE version?

Does the facts:


phone detects network as LTE (though is unable to connect to it),
after upgrading system to 4.4.2 KitKat I have access to new option Settings &gt; Wireless &amp; networks &gt; More &gt; Mobile Networks &gt; Preferred network and I can select 4G there.


are enough to be sure, that this is really an LTE-based version of ASUS Nexus 7 tablet?

My doubts come from three facts: 


When I insert a LTE-compatible SIM card, tablet is able to detect, that it is in LTE signal range, but is unable to login to LTE network and obtain an IP address. The very same card inserted into another LTE device (some Samsung phablet) logins to LTE network at once and works like a charm.
Working Samsung was checked at provider's office and provider's representative did check APN. Beside, SIM cards used by this provider are somehow self-configurable. Once inserted, they set APNs by themselves and select the proper one.
I've checked and verified, that my network carrier (Polish Plus GSM) is using LTE on the 1800 MHz band, which is confirmed to be all fine with ASUS Nexus 7 II (2013) LTE tablet.


Are there any other things, that I can check to make myself sure, that I really have LTE model?
The issue is most likely caused by a wrong APN configuration. Though customer care told you their card is "self configurable", this may well be relative: many ROMs (especially custom ROMs like cyanogenmod) come with a built-in list of APNs, which are matched against the provider as specified by the SIM card, and used correspondingly.

While those matches usually are fine, there might be exceptions – e.g. when the provider made changes to his configuration after the ROM was released. Or did not provide all details: APNs might need different parameters for e.g. 3G than for LTE. As you've got a second Android device where the card is working fine,


put the SIM into that device
go to Settings (usually network → telephony or similarly; different ROMs might place it slightly different)
tap the APN and select to adjust it
do not adjust anything, just write down its parameters


In a second step,


put the same SIM to your N7
go to the same Settings page
compare your values and, if something differs, adjust it


I bet your device then will connect fine. If not (or if there are no differences), it's probably a hardware issue, and you need to send your N7 for service.