I have the Sprint IPhone 4- will this phone have ability to jailbreak?

If I'm under contract, would this phone be able to have the jailbreak installed? Also, an android Samsung 1500 w/out service- could this device be jailbreak-d and how do I get service after its done? Really new to this technology but wanting to learn.

Yes you can jailbreak the iPhone with absinthe software from http://greenpoisi0n.com it only takes seconds just go to the website download the software the computer and click jailbreak and it's done after seconds also you can't jailbreak android devices but if you want you can root it with z4 it only takes about 5 minutes if your connected to Wi-Fi on the android phone google z4 root APK download it and open it on your phone and it will install I've done it plenty of times

Yes, all iPhones have the ability to jailbreak.

Try reading the answers to the last few dozen people who already asked about jailbreaking sprint iPhones.