Today, most telephones support multiple bands as used in different countries to facilitate roaming. These are typically referred to as multi-band phones. Dual-band phones can cover GSM networks in pairs such as 900 and 1800 MHz frequencies (Europe, Asia, Australia and Brazil) or 850 and 1900 (North America and Brazil). European tri-band phones typically cover the 900, 1800 and 1900 bands giving good coverage in Europe and allowing limited use in North America, while North American tri-band phones utilize 850, 1800 and 1900 for widespread North American service but limited worldwide use. A new addition has been the quad-band phone, also known as a World Phone,[4] supporting at least all four major GSM bands, allowing for global use (excluding non-GSM countries such as Japan, South Korea and as well countries where 2G system was shut down to release frequencies and spectrum for LTE networks like Australia (since 2017), Singapore and Taiwan
There are also multi-mode phones which can operate on GSM as well as on other mobile phone systems using other technical standards or proprietary technologies. Often these phones use multiple frequency bands as well. For example, one version of the Nokia 6340i GAIT phone sold in North America can operate on GSM-1900, GSM-850 and legacy TDMA-1900, TDMA-800, and AMPS-800, making it both multi-mode and multi-band. As a more recent example the Apple iPhone 5 and iPhone 4S support quad-band GSM at 850/900/1800/1900 MHz, quad-band UMTS/HSDPA/HSUPA at 850/900/1900/2100 MHz, and dual-band CDMA EV-DO Rev. An at 800/1900 MHz, for a total of ‘six’ different frequencies (though at most four in a single mode). This allows the same handset to be sold for AT&T Mobility, Verizon, and Sprint in the U.S. as well as a broad range of GSM carriers worldwide such as Vodafone, Orange and T-Mobile (Excluding-US), many of whom offer official unlocking.
As the modern workforce grows increasingly mobile the gsm with the available internet has improve to cloud communications, they have break the chains between employees and their desks. In 2018, more than half of the employers in an Upwork study revealed that they didn’t have the policies in place to support remote working, even though half of the workforce will be mobile by 2020.
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Features:
3 Bands GSM PDA Mobile Phone
Bluetooth and FM Radio is optional, 2.2inches QVGA screen
Platform: MTK6226
Band: E-GSM 900/1800/1900
Talking time: 120 – 180min
Standby time: 120hrs
Battery: 800mAh Li
Dimensions: 99 x 43.5 x 10.2mm
Type: super slim bar
Screen: 262K colors, QVCA, 176 x 220, 2.2 inches
Code: FR/EFR/AMR
Polyphonic ring tone: 64
Memory: 128MB/32MB + nand 64MB + T flash
Camera: 1.3M
MP3/MP4: Yes
Language: English, Chinese, Vietnamese, Indonesian or Russian is optional
WAP: 1.2.1
GPRS/SMS/EMS/MMS: yes
Predictive text input: T9
Show time: Yes
Calculator: Yes
Keyboard lock: yes
Color: black, white, red
Silent: Yes
Games: Yes
Bluetooth and FM Radio: Optional
Accessories: Charger, 2 batteries, USB data line, 128M T-Flash card, English user manual