Jailbreaking iPhone 4 security issue?

Hi guys so all my friends jailbreak there iPhones and I never have but I've been craving to play Pokemon ever since summer and now I heard I can get Pokemon on my iPhone if I jailbreak it.

My concern is that I use mobile banking on my iPhone and I'm not sure if I'm just paranoid but if someone puts a code to bypas the apple security then is it also possible to bypas my bank app? I've got a pass code on my app but could they use key loggers like on computers?

My iPhone is on the latest iOS and I'm not intrested in ios6 so I'm really intrested but hesitant due to the security concerns!

Jailbreak will not break the security as long as you do not download any virus.

It is safe to jailbreak.

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