iPhone X Any issue just moving existing SIM card ?

[lexdiamonnyc]

I didn’t move any SIM card. Just turned it on, activated and that’s it.

same here. at first I was going to swap SIMs but noticed my new Max (AIUP) already had a SIM in it.....so I gave it a go and it booted right up and registered no problem.

 

[Jaekae]

I have the same simcard as my iphone 5 now , and had 6, 6s, 7, 8 and now xs and no issues ever