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Eircom Limited, trading as Eir (/ ɛər / AIR; stylised eir), is a large fixed, mobile and broadband telecommunications company in Ireland. The company, which is currently incorporated in Jersey, traces its origins to Ireland's former state-owned monopoly telecommunication provider Telecom Éireann and its predecessors, P&T (the Dept. of Posts and Telegraphs) and before the foundation of the ...
KDDI's au IC-Card Sierra Wireless AirCard 555R PC Card wireless modem for the China Unicom network with R-UIM interface (extension at the front). Removable User Identity Module (R-UIM, usually pronounced as "R-yuim") is a card developed for cdmaOne/CDMA2000 ("CDMA") handsets that extends the GSM SIM card to CDMA phones and networks.
Wi-Fi calling, also called VoWiFi, [1] refers to mobile phone voice calls and data that are made over IP networks using Wi-Fi, instead of the cell towers provided by cellular networks. [2] Using this feature, compatible handsets are able to route regular cellular calls through a wireless LAN (Wi-Fi) network with broadband Internet , while ...
Mobile virtual network operators (MVNOs) in Ireland lease wireless telephone and data spectrum from major carriers such as Vodafone, Eir, and Three for resale. As of Q3 2024, the market share of MVNOs in Ireland is 14.0%, including Tesco Mobile with 8.0% and Virgin Mobile with 2.3%. [1]
An encryption key is also generated that is subsequently used to encrypt all wireless communications (voice, SMS, etc.) between the mobile phone and the GSM core network. If the authentication fails, then no services are possible from that particular combination of SIM card and mobile phone operator attempted.
Eir's dominance has reduced and by Q3 2019 operators other than eir accounted for 61% of the Irish fixed voice market retail revenue and 54.7% market share by fixed-line retail and wholesale revenue and 80.9% of the mobile market (excluding mobile broadband and machine-to-machine subscriptions) or 84.4% of total subscriptions.
The phone identifies the subscriber by transmitting the International mobile subscriber identity (IMSI) number, which is stored on a SIM card that can, in theory, be transferred to any handset. However, the network's ability to know a subscriber's current, individual device enables many network and security features.
eSIMs are better suited for Wi-Fi hotspots due to seamless network switching and enhanced security. [36] The eSIM chip is half the size of the smallest physical SIM card, allowing phone designers to use space for other applications. [5] eSIMs provide cost savings when traveling internationally. [5]