my uncle has At&t as his carrier. Well he has a work phone to but it’s through Verizon. He’s wondering if he gets an iPhone XS Max through At&t can he put his Verizon and At&t sim in. And will it work with both? Thanks for any info
1. Verizon (at this time) does not play well with dual sims unless it's the primary sim. (it can down to 2g speeds)
2. Just because the phone is unlocked doesn't mean it can use dual sims (His work may provision the phone so dual sim won't work)