Single-port USB setup
Fits a simple modem path when the project is small and the operator wants a direct plug-and-play workflow.
USB GSM Modem for Bulk SMS and Internet Routing
Bulk SMS hardware
USB GSM Modem for Bulk SMS and Internet Routing
A sms gateway modem keeps bulk messaging hardware in one place, while a usb gsm modem makes plug-and-play setup easier for desktops, laptops, and room-based SMS jobs.
1-2-3-4 portsIndependent ports with SIM slots
USB or UARTConnection paths for different setups
4G LTE / GSM / CDMA / WCDMANetwork modes for flexible setups
SMS Caster / AT / IMEI / USSDSoftware and command tools listed
Port-count map
Read the port label as a hardware clue
The 1-2-3-4 port label helps decide whether the build needs a single USB path, multiple independent ports, or a larger SIM path through a UART hub.
Independent SIM slots
Each port has its own SIM card slot, which makes the configuration read like a real hardware map.
Higher SIM count path
A 4-port UART hub path can insert 8 SIM cards and send and receive SMS at the same time.
Hardware snapshot
Keep the network mode, software path, and SMS tool in one view
The same device is described as a wireless internet tool and a bulk SMS sender, with 4G LTE connectivity, SMS Caster support, and AT-style command functions for day-to-day control.
| Connection | USB or UART |
|---|---|
| Network modes | 4G LTE, GSM, CDMA, WCDMA |
| SIM structure | 1-2-3-4 ports with SIM slots; page also mentions a 4-port UART hub path |
| Software and commands | SMS Caster, AT command, Change IMEI, USSD, SIM status check |
| Use cases | Wireless internet access, bulk SMS sending, alerts, notifications, and campaign messaging |
| Speed note | Approximately 3600 SMS per hour per port |
Related hardware
Other YX products that sit near the same use case
These cards keep the hardware family focused without turning the layout into a broad catalog of unrelated products.
4G LTE USB SMS Dongle
Useful when the setup leans toward a simpler single-SIM dongle and fast USB deployment.
Open product
2G 1-8 Port SMS Modem
Helpful when the buyer needs to compare a larger port range and a multi-SIM configuration.
Open product
EC25 1-8 Port SMS Dongle
Works as a nearby option when the project needs a higher port count and a wireless internet layer.
Open productRelated reading
Three text notes that help avoid a wrong label
Use these notes when the decision is about wording, port count, and device behavior rather than appearance.
Reading note 1
Separate USB GSM modem, SMS dongle, and 4G dongle
Good for buyers who need the product family sorted before they pick a box or a label.
Open articleReading note 2
Read port counts without assuming capacity
Useful when the job looks like a 1-4 port choice but the real decision depends on the full setup.
Open articleReading note 3
Understand what 1 to 4 ports actually shows
Helps the reader treat port version as a hardware clue instead of a promise about throughput.
Open articleFAQ
Common questions before buying
What is this device used for?
It is one device for wireless internet access and bulk SMS sending, with plug-and-play setup and SMS software support.
How many ports are available?
It is shown with 1-2-3-4 ports, and each port is independent with its own SIM card slot.
Does it work through USB or UART?
Yes. It connects via USB or UART, so it can fit both direct computer use and other hardware setups.
What networks and software are mentioned?
It supports 4G LTE, GSM, CDMA, and WCDMA networks, plus SMS Caster software, AT command support, IMEI change, USSD, and SIM status checking.
What does port count tell me?
Port count helps identify the hardware configuration, but it does not by itself prove SMS capacity or throughput.
What should I send when asking for pricing?
Send the product type, SIM count, port count, software needs, network bands, usage scenario, and any special setup requirements.
