On Monday, several reseller outfits began taking orders for the iPhoneSIMFree unlock, the first commercially available software that allows iPhone owners to swap out SIM cards in order to run their handsets on wireless carrier networks aside from AT&T's.

The software, according to Macworld UK, retails for US$99 and is being sold at outfits such as New York-based Wireless Imports. The reseller was waiting for iPhoneSIMFree to deliver the licenses and any preorders taken yesterday are supposed to be filled within 48 hours.

iPhoneSIMFree has also gone out the door to other supplies. iPhone Worldwide Unlock, an Australian web site, cited that the hack was available for US$50 and that the outfit had already received 1,000 orders. A German reseller also stated that it had priced the unlock at US$50 but was unable to quote how many preorders had been received.

At this point, the resellers are making a point to stress on their web sites that they can't guarantee that the unlock will survive through the next iPhone (and/or iTunes) updates from Apple. The outfits have echoed caveats regarding iPhoneSIMFree, which is run by a still-unknown group of developers.

"In the event Apple comes out with a new firmware upgrade which will lock your phone again you hereby agree that Wireless Imports nor its vendor will be held liable or responsible for unlocking your handset again," the company's site states. "If your handset becomes locked you will be charged to unlock it again."

Apple has not responded to questions as to whether it will relock iPhones in future software updates or whether it's considering legal actions against the resellers.