what can i do if i encounter jailbreak on my iphone

You can try restoring the phone as new in iTunes, but this may not work. Support for jailbroken phones can't be given in this forum.

if you would like to jhailbreak your phone please look elsewhere as we cannot help you on this site

As we can't talk about jailbreaking all I will say is do a dfu restore if that doesn't work I can't help you on this forum, ask on a different one

Remove the jailbreak by performing a full system restore on your computer. Like it never even happened.

You don't "encounter" a jailbreak. You would have to download the software to jailbreak it. Stay away from jailbreaking and you will be fine.

That doesn't always work..

even ios doesn't work many times.

That is enough of the jailbreak supporting. Encouraging people to hack their phones, really?

whytobother wrote:

even ios doesn't work many times.

Huh? What's that got to do with trying to remove a jaibreak?

if you want to remove a jailbreak just restore the device

Roadz This Guy wrote:

if you want to remove a jailbreak just restore the device

Sometimes that works. And sometimes it doesn't.

If you wish to remove the jailbreak on your iDevice, you will have to restore it via iTunes.

But you can't restore to any iOS version you want. You only have permission to restore to the latest iOS version that Apple is still signing shsh blobs for.

As an alternative, you can get the shsh blobs that will allow you to restore to any other iOS version from cydia.

But I am telling you : this doen't always work because it can be that cydia also doesn't have the shsh blobs.

So I recommand you to restore/upgrade to the latest iOS verison available for your iDevice.