Updating an unlocked iphone
Your mileage may vary, and isolated incidents of bricking have occurred, but most people are just going to have a 3rd party-free, AT&T-only i Phone in their pocket when the day is through, and bricking seems to be just as common for a virgin i Phones as for jailbroken ones.
As for when we'll have use of the i Phone again is unclear, but TUAW's Erica Sadun says "don't expect a jailbreak anytime soon," which doesn't seem promising.
The most serious problems we're hearing so far relate to i Phone Dev Team's any SIM unlock, which has left some i Phones "bricked" with an "Incorrect SIM" error message (seen above).
That's not to say a workaround won't be found in the future, but for now any SIM users should certainly stay away from 1.1.1.
Carrier settings updates let your carrier provider update carrier network and related settings to improve cellular network connectivity and performance or add support for features like Vo LTE or Wi-Fi Calling.
For more information on what is included in a carrier settings update, contact your carrier.
You can manually check for and install a carrier settings update using these steps: Information about products not manufactured by Apple, or independent websites not controlled or tested by Apple, is provided without recommendation or endorsement.