SIM lock

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SIM lock

(Subscriber Identity Module lock) A function in GSM cellphones that restricts the phone's use to a particular cellular carrier (a particular SIM card). SIM locks are used to ensure subscribers finish their service contracts when the phones are heavily subsidized by the carrier. SIM locked phones may be unlocked by entering a code.

Apple's iPhone brought the SIM lock into public view because of its original exclusivity in the U.S. with AT&T. However, iPhones were readily "unlocked" by hackers both in and outside the U.S., not only to use a different carrier, but to customize their appearance and download applications even before Apple debuted its App Store. In addition, Apple allowed the GSM iPhone to be sold without the SIM lock in Australia, Taiwan, Hong Kong and other regions where locked phones were either prohibited or a recipe for marketing failure. See SIM card and iPhone jailbreaking.
References in classic literature ?
The law cannot, as you say, touch you," said Holmes, unlocking and throwing open the door, "yet there never was a man who deserved punishment more.
Or that she should be the first to possess the skill of unlocking a cabinet, the key of which was open to all!
The black grumbled something that I could not understand, and then I heard him unlocking the door into one of the other cells on the further side.
as of an intellect doubled on itself), by abandonment to the nature of things; that beside his privacy of power as an individual man, there is a great public power on which he can draw, by unlocking, at all risks, his human doors, and suffering the ethereal tides to roll and circulate through him; then he is caught up into the life of the Universe, his speech is thunder, his thought is law, and his words are universally intelligible as the plants and animals.
This was the treasure house of the band, and thither Robin Hood went and, unlocking the door, entered the chamber, from which he brought forth a bag of gold which he gave to Little John, to pay Hugh Longshanks withal, for the cloth of Lincoln green.
Soon he paused before a little white gate marked private, and, unlocking it with a key which he took from his pocket, passed through a little plantation into a large park-like field.
In that case," she said, seating herself in a doorway and unlocking her satchel, "I shall have to put on my rubber boots.
After the lapse of a minute or two, the noise of somebody unlocking the yard-gate was heard, and presently a tall lean boy, with a lantern in his hand, issued forth.
There was a long stillness slowly broken by the metallic noises of Gilder unlocking the handcuffs of Patrick Royce, to whom he said: "I think I should have told the truth, sir.
While Larsan was unlocking the gate, Monsieur Darzac inquired what had brought me to the Glandier at such a tragic moment.
He tore a sheet of paper from his pocket book, and unlocking a small gold case at the end of his watch chain, shook from it a pencil with yellow crayon.
When the officer had seen him to the porch, he returned, and again unlocking and unbarring the door of the cell, set it wide open, informing its inmate that he was at liberty to walk in the adjacent yard, if he thought proper, for an hour.