You forgot the hairclip!

It's obvious. You break open all but two of the phones and take out the batteries, using them to make an explosive Lithium paste which you spread on a pizza.

Then you use the chewing gum to attach the hairclip to one of the remaining phones, place it on the explosive pizza, and rig it to act as a detonator when the phone is dialed.

You put the squeeky toy on the pizza to attract attention and throw the pizza like a frisbee out of the warehouse.

Use the last phone to dial the explosive pizza. All the bad guys will be thrown through the air and knocked out.