A: Downloading a decrypted IPA is a legal gray area. It violates WhatsApp’s Terms of Service, but unless you distribute it, individual use is rarely pursued.
For iOS 6.1.3 on iPhone 4S, use p0sixpwn or the simpler Phoenix jailbreak (if downgraded from 9.3.5). For iPhone 4, use redsn0w . whatsapp ipa ios 6
Or can you?
