iPhones 4/4S/5 and Samsung phones have become a hot commodity.
1. DO NOT WALK AROUND WITH YOUR IPHONE CLEARLY VISIBLE. If you're going to take a call, stop walking and look around you before you do. Kids are targeting iPhone users because of their high resale value or they're changing out the cards in the phones for themselves.
2. Do not listen to music using the stock earbuds. iPhone users are easy to spot by their distinctive white earbuds, and the new earbuds that come with iPhone 5. Go to Radio Shack, Amazon, FYE, Target, etc. and get some different buds, preferably some black ones that aren't so prominent and easily give away that you're using an iPhone.
People are normally being targeted on the street and on mass transit. We've already had several robberies in Fishtown and Kensington and one just happened today all the way up in Bridesburg, and it was at gunpoint.