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du first launched LTE in 2012 on the FDD-LTE Band 3 (1800 MHz) frequency, in August 2014 it was then announced that du had installed and successfully tested VoLTE over its network. In July 2014, du launched Cat. 6 LTE-Advanced with carrier aggregation and 4x4 MIMO combining 20 MHz of Band 3 (1800 MHz) and 15 MHz of Band 20 (800 MHz). [9]
This is in contrast to a phone (retrospectively called SIM-free or unlocked) that does not impose any SIM restrictions. Generally phones can be locked to accept only SIM cards with certain International Mobile Subscriber Identities (IMSIs); IMSIs may be restricted by: Mobile country code (MCC; e.g., will only work with SIM issued in one country)
If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...
A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).
And while there were exceptions for free zones and modern housing developments, for the majority of the UAE, Etisalat held a monopoly on business and personal telecommunications services. In February 2006, this monopoly became a duopoly when a new telephone company and Internet service provider (ISP), du , was established to offer mobile ...
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