Is Jailbreaking an Unlocked Iphone 4s Safe?

So, I have an Unlocked iPhone 4s. Running 5.1.1.So, If I jailbreak it using absinthe, Will it remove my Unlock?
And Can I manually upgrade to 6.0.1 using itunes without removing my Unlock? Please Answer. I'm in need of some quick info.

Should I get cydia on my iPhone 4?

Now… Or shall I wait till I get my next iPhone which is the iPhone 6 when it comes out. Are there any side effects? Is it safe for the phone? Can i delete it if I want to?

Blog website that's popular on iphone?

What's a good blog site (or iPhone app) for me to write my life story and get lots of
followers?

It's not necessarily that I want to bore people with a life story of someone they don't know. It's just that I want to tell my story and find some friends who might be interested and listen and possibly offer some advice.

How to restore apple iphone 3g without updating software?

This is why i hate apple products, but anyway i wanted to use it purely for music, since i have a different computer i can't delete the music off this ipod. So best thing to do is restore back to factory settings. But it tries to download an update, and then fails. This is so frustrating, why does apple have to be so annoying with restoring devices and syncing etc.

Can I put my iPhone 5 sim into another phone?

I have to send my iPhone 5 off to get repaired
Can I take the SIM card out and put it into another phone? It's a tiny SIM card like a nano sim or something, so would it still work?
I'm on Vodafone btw

What is MF Message Error Domain error 1032? - 1

My iPhone keeps displaying this message and its really annoying. I have read that deleting your yahoo email profile can resolve this but will it erase all my emails currently on my iPhone. Or will it redownload them when I re-register my yahoo email account?