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Yes, unlimited int'l talk and text from U.S. to >35 countries; unlimited talk, text, and data (1 GB 4G LTE, then unlimited 2G unless additional data packs purchased) while roaming in >35 countries [335] Yes [338] [339] CDMA not supported, only LTE (thus non-WiFi voice is VoLTE). Reportedly uses Sprint as primary network and only roams to AT&T ...
Furthermore, a 4G/LTE device may say “Emergency Calls Only” within the system settings or notifications area but that message does not prove the device can actually make an Emergency call over 4G/LTE. [14] Additionally a device may be configured for 4G Emergency Calls in a given region but fail to connect when placing a 4G Call in another ...
A hardlocked phone is one in which a telecom provider has modified the firmware on the phone to make it impossible to manually enter the unlock codes in any way. The only solution to SIM-unlock such a phone is to change the firmware to a firmware which has not been modified by any telecom provider, a so-called "unbranded firmware".
STK has been deployed by many mobile operators around the world for many applications, often where a menu-based approach is required, such as Mobile Banking and content browsing. [1] Designed as a single application environment, the STK can be started during the initial power up of the SIM card [ 5 ] and is especially suited to low level ...
QMobile 4G Plus (Pakistan) GeoPhone T15, T19, T19i (Made in India for Bangladesh) Sigma mobile X-Style S3500 sKai (Ukraine) Ghia KOX1, GK3G, GQWERTY (Mexico) myPhone Up Smart, Up Smart LTE (Poland) [42] Symphony PD1 4G (Bangladesh) BKAV C85 [43] (Vietnam) in partnership with Viettel. This is the only KaiOS device to not feature Wi-Fi support
In telecommunication, a public land mobile network (PLMN) is a combination of wireless communication services offered by a specific operator in a specific country. [1] [2] A PLMN typically consists of several cellular technologies like GSM/2G, UMTS/3G, LTE/4G, NR/5G, offered by a single operator within a given country, often referred to as a cellular network.
USSD can be used for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and as part of configuring the phone on the network. [1] The service does not require a messaging app, and does not incur charges. [2] USSD messages are up to 182 alphanumeric characters long.
The North American Standards IS-54 and IS-136 were also second-generation (2G) mobile phone systems, known as (Digital AMPS) and used TDMA with three time slots in each 30 kHz channel, supporting 3 digitally compressed calls in the same spectrum as a single analog call in the previous AMPS standard. This was later changed to 6 half rate time ...