Want to make your iPhone speaker louder according your own wish, there’s an iPhone app names Volume Boost x3 that will triple your iPhone audio volume, the app is provided in Cydia at the ZodTTD repository, but one thing you must keep in mind that using this could effect your iPhone performance and also your 2 ears, one more thing Volume Boost x3 only for jailbroken iPhone and iPod touch
Note: do not use at full volume for extended periods of time, because your iPhone speakers may be blown!
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