Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
You can use it with one SIM cards and other SIM is optional. To put it in the SD card, you have to take out the back cover. Next to Camera (on right side), you will see slot for SD card there (with a label next to it). So put the SD card on the slot and slide it in. See this video --> https://www.youtube.com/watch?v=XhvDGhy1-fs
If you have any questions or would like any additional information, please don't hesitate to ask.
No SIM means there is no SIM on one slot and No Service means the SIM card you put it is not working on the phone or there is no enough coverage to get signal. Did you check the SIM on another one ?
The video was for reference only. Do you have another SIM to check ? To make sure, this is an factory unlocked phone. Right ?
Is this is a factory unlocked G4 ?
Put in the SIM on SIM 2 slot and does it work ?
Did you try both SIM slots ?
After that, restart your phone. Go to Settings > Mobile Networks and change the network mode to GSM only. Does it work in GSM mode only ?
You can add a bookmark of this page or add this page to your favorites, so you can get back to me later.
This question will not be closed. I've seen this issue before. Issues with SIM can also cause this problem (yes, even if it is working on another phone). If possible, test with another card and this will tell us what the issue is. Remember to change the network mode and test. Good Night.