If you have an iPhone, don't bother getting the physical Suica card. You can add one in the Wallet app, and also charge it with your credit card directly! Moreover, you can do this ahead of time, before arrival to Japan.

Wallet app -> "+" on top right corner -> Transit Card -> Japan -> Suica.

Choose PASMO or ICOCA if you want to be different. ;-) All three are functionally equivalent.

The virtual card will work anywhere the physical card's accepted, so transit, convenience stores[0], vending machines, etc. IMHO there's no reason to get a physical card, unless you want a souvenir.

I'm sure the same could be done on Android, but I don't know the procedures.

[0] At least in Tokyo, many convenience stores will also accept contactless credit card payments (i.e. Apple Pay), even foreign cards. The process is sometimes a little convoluted, however, so if you just want to grab & go, use Suica and say "Suica de" and 99% you'll be in & out in less than a minute.