When you notice “NO APN” in your toolbar, it means that the UNI-GR1 has a SIM card inserted but that you still have to configure the APN settings to get a mobile data connection.
It’s most likely that you are seeing this, because you have reset your settings, changed your SIM card or it might be the first time you entered this card. To make a connection with 3G internet, you have to configure the APN settings. We suggest you read our article: What do I set in the mobile data settings? about setting the right settings for the APN.