Have you used this DIY method? Also what did this mean: "Make sure the leads line up with the ones below them!" I looked at the sims and one has 4 "teeth" and the other has three. Do you just line up the edge?
Ive used a duo sim, you can only use one at a time but ik I need my backup phone for kayaking or other iPhone endangering stuff, I just take a nokia 6300 and am on my way. I put the iPhone in airplane mode so I do t need to turn it off either.