What would happen if I jailbreak my iPhone?

My iPhone is unlocked through a chip with the sim card, I want to jailbreak my phone but I don't know if there are anything that would make me concerned about it. Like could it make the chip not compatible?

Heres some tips from an ex-jailbraker:
GET UNTETHERED! THATS WHY I UNJAILBROKE!
make sure you have enough room
make sure you check youtube to make sure the cydia app is safe (winterboard won't hurt)
And your chip will work.
Try Evasi0n, i want to try it, but my dad won't let me.

Nothing will change. Unlocking and jailbreaking are two different independent things.
IMHO I would go for a factory unlock instead of a SIM card adapter. You can't update the system if you are using the adapter.

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