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Fixed Dialing Number (FDN) is a service mode of a GSM mobile phone's SIM card. [1] Numbers are added to the FDN list, and when activated, FDN restricts outgoing calls to only those numbers listed, or to numbers with certain prefixes. [1]
A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.
Optus has an intercept message which is heard by Optus customers when the network is congested or when a technical fault prevents customers from making phone calls: "Unfortunately due to temporary service difficulties, we are unable to connect your call at this time. Please try again later". After the message is played, the call will disconnect.
Calls can also be dropped if a mobile phone at the other end of the call loses battery power and stops transmitting abruptly. Sunspots and solar flares are rarely blamed for causing interference leading to dropped calls, as it would take a major geomagnetic storm to cause such a disruption (except for satellite phones ).
Calls initiated on Wi-Fi by non-VoLTE devices will transfer calls to the LTE network if Wi-Fi coverage becomes too weak to sustain the call, although they are unable to initiate calls on LTE. As a result of the Merger with T-Mobile US , the Sprint LTE network was shut down on June 30, 2022.
TracFone Wireless, Inc. (TFWI) is an American wireless prepaid service provider. It is a mobile virtual network operator offering prepaid and no-contract services on the Verizon network under multiple brands, including TracFone, Straight Talk Wireless, Total Wireless, Simple Mobile, SafeLink Wireless, and Walmart Family Mobile in partnership ...
Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.
Starting from the Samsung Galaxy Note 3, Samsung phones and tablets contained a warning label stating that it would only operate with SIM cards from the region the phone was sold in. A spokesperson clarified the policy, stating that it was intended to prevent grey-market reselling, and that it only applied to the first SIM card inserted. [ 41 ]