Should I get this phone to replace my iPhone 3GS?

Currently I'm using an iPhone 3GS, and its currently on ios 6.1.3, and i've been told that this phone will not receive the new ios 7 when it is released. Currently I have my iPhone on straighttalk, so Its no problem getting another phone. Right now straight talk has a blackberry curve i that i'm interested in. All I do with the phone is get on facebook, use facebook messenger, and use apps like kik, snapchat, and twitter. So is this a good phone? Here is the link for the blackberry, http://www.shopstraighttalk.com/bpdirect/straighttalk/PhoneDetails.do?action=view&productVariantExtensionId=21305827

I had the old curve. The new one is better but id rather use a 3gs. Its personal prefrence but i would use 3gs

Any blackberry is better than any iphone.yes, get the blackberry. Its so much more user friendly.