If you ever wished for wireless internet connectivity as good as you have it at home, look no further. Link Pro is your scalable solution for internet bandwidth when you need it, offering a 600 ft. wireless range, dual band 2.4/5GHz operation, and compatibility with up to six 3G / 4G / LTE modems from any region around the world.

Sixfab Raspberry Pi 4G/LTE Cellular Modem Kit. The newbie-friendly Cellular Modem Kit provided by Sixfab comes with two LTE antennas, a Micro USB 2.0 cable, the 3G/4G/LTE HAT, in addition to the needed module (based on the buyer’s country.) Speaking of modules, their Sixfab lists all their supported certifications, carriers, supported regions
A useful website, willmyphonework.net can quickly show you whether a phone will work on your operator’s network and which network bands it will cover. Just head to the site, use the drop-downs to select your phone (be sure to get the exact model number), your country and your network, and it will then show you how it will manage 2G, 3G and 4G

3G is not GSM, although many 3G modems are backward compatible (for now). GSM as such ended with 2.5G. The problem doing what you ask, is that the current modems generally support a number of 3G bands, but not all so for example in Australia I have to deploy one version for Telstra, and Vodafone 2100, but a different modem chipset for Optus 2000/900 and Vodafone 850/900

Available WAN Connection. The WAN/LAN port enables Archer TL-MR6400 to work as a traditional wireless router which is compatible with cable, fiber, and DSL modems. And when it's set as a wireless router, its 3G/4G connection works as a backup to provide a sustained and reliable internet connection for you. Modem Internet. A 3G modem is a device that allows a computer to connect to the Internet via a high-speed mobile broadband connection. This means that the Internet signal is broadcast over the airwaves rather than sent and received through a cable or telephone line. 2. Can 3G modem support 4G? T-Mobile shut down its 3G service on July 1, 2022. Verizon's 3G network will shut off on Dec. 31, 2022. The carrier has made it clear that "the date will not be extended again." You can find more

LTE (telecommunication) In telecommunications, long-term evolution ( LTE) is a standard for wireless broadband communication for mobile devices and data terminals, based on the GSM / EDGE and UMTS / HSPA standards. It improves on those standards' capacity and speed by using a different radio interface and core network improvements.

Theoretically these can support speeds of up to 7.2 and 21 Mbps, respectively, but in real world scenarios they are only marginally faster than most 3G data services.
The nationwide phaseout of 3G cellular service impacted vehicles that offered a number of remote features using apps and integrated modems. While Ford made modems standard on every vehicle a few short years ago, they run on the newer 4G cellular spectrum, and newer vehicles like the 2023 Ford Super Duty now utilize 5G, a potential harbinger for an eventual phaseout of the older standard.
According to Wikipedia, PTel Mobile supports only GSM 850/1900 frequencies. so SIM 900 supports ( 850,900,1800,1900 MHz ) you must use SIM900. Considering about the speed you cannot obtain 3g, 4g speed since GSM Shield (SIM900) provides maximum of GPRS class 10: max. 85.6 kbps (downlink) so, It will able to connect but cannot get such speed in
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    • can 3g modem support 4g