Camera links to phone sometimes and other times not?

[DeanoG60]

Haven’t you already asked this here:

Phone won't connect to DJI Phantom 3

Hi All. Question please, I have a spare phone that has nothing on it, so i thought I could use it with my DJI P3 that I have just purchased, the phone does not have a sim card in it, So I thought i would try to see if it will connect to me drone, I managed to download the DJI Go app onto it no problem, but the phone will not cennect to my drone, do i NEED to have a sim card in my phone or should it just connect no problems. I also tried on my phone that I use every day, and this connected no pr…