Abstract: Read calibration by sector of memory can include reading a page of memory, having more than one sector, with a read level, such as a default read level. In response to an error, such as an uncorrectable error correction code read result, the respective read level can be calibrated for each sector to yield a respective calibrated read level per sector. The page of memory can be read with the respective calibrated read level per sector. The calibrated read levels can be stored.

Abstract: There is described a technique of enabling a SIM card of a mobile telephone and associating payment value to the SIM card, the method comprising: associating a unique identifier of the SIM card with a unique identifier of the payment value; retrieving an identity of one of the SIM card and a card associated with the payment value at a point-of-sale; transmitting a message including the retrieved identity; responsive to the message, enabling the SIM card and applying the payment value as a credit to the SIM circuit.