If you are unable to use your Yes Life app after updating your device to iOS 5, fret not, because Yes 4G is aware of this problem.

They are currently working on it and should be releasing an updated version of Yes Life which will be compatible for iOS 5.

Not sure on how long will it take to release the update (no indication from Yes 4G) but hopefully it will be soon. From what I see, Yes 4G’s broadband speed and reliability is fantastic. However, their voice and sms services (Yes Life) is still below average. I advise you not to solely rely on VOIP services (in general) during emergency.