I got this one already http://www.ebay.com/itm/LG-G3-F400-G...item1c41f4ea4f as it cover the whole back and edge, no need to have any cover, really nice back cover (or you can say it is phone case :D)
sorry about that.. it would be the baseband problem.. as I tried in Samsung E250K (Korean version of Note2), doesn't work, but work on N7105... and my friend tried on Vega 860S, doesn't work too...
I am using one from China, cost around RMB50(~USD9.0), look like the magicsim for S3, but the chip look thicker than Magicsim.
I tried the magicsim for F240s, but it doesn't work.