Remove sim card with phone on

[hasole]

is it safe to do this or should you power down?

 

[mrapplegate]

is it safe to do this or should you power down?

I think deep in your heart you know the answer. Better safe than sorry, power down.

 

[Intell]

It is safe to leave the phone on when removing or inserting a SIM card.

 

[hexonxonx]

100% safe. I've been doing this since the very first iPhone.

 

[rjohnstone]

I do it all the time when testing various apps between phones.
Not a big deal.