I recently purchased a GRS-1 on eBay. Can I connect to an RTK network using wi-fi and a hot-spot and completely bypass the modem? I have been unable to connect to the gnss receiver in the GRS-1. With the 3G shutdown, I can't get the modem to work, and no cell company will set up a new data account for a 3G device. In addition, I can't find the IMIE number. Appreciate any help