Will this SIM card work in an iPhone?

I live in Spain and use Orange as my cell phone carrier.

I'm buying an unlocked iPhone to replace my current phone, but I'm unsure if my SIM card will work.

Pic here:
//postimgs.org/apple-touch-icon.png

I realize I must "trim" my SIM card down to size to fit into the iPhone, but it appears that the actual metallic surface of the SIM is SMALLER than the metallic surface of the useless SIM in the iPhone already.

Once I trim it down (using a stapler like device I bought on Amazon), will this still work properly?

The blue one cuz the white one is too bigger but you can cut it so the same size of the blue an insert it on the iphone

If the phone is unlocked then any SIM will work in it.

Doesn't matter. Once the SIM fits it'll work. That stapler like device is a microSIM cutter for the record.