YX 2G 16 Ports GSM Bulk Send SMS Modem IMEI Change SIM Pool included SMS Caster Software

Core Features & Highlights

• Flash every 3s = Normal network registration
• Flash every 1s / Always on = SIM/network exception

Complete Installation & Operation Steps

1. Hardware Connection

1. Insert 16 activated SIM cards into the slots correctly, and install 2G GSM antennas for all ports.
2. Connect the modem’s USB port to the PC’s USB port via data cable.
3. Plug in the power adapter (AC 100-240V) and turn on the power switch.
4. Check LED indicators to confirm normal power-on.

2. Driver Installation

1. Open Device Manager
2. Locate Unknown Device or USB Serial Device (COM).
3. Right-click → Update Driver → Browse my computer for drivers.
4. Select the extracted XR21V1414 driver folder (match 32/64-bit system).
5. Successful installation: Ports display as XR21V1414 USB UART Ch (COMxx).

3. SMSCaster E-Marketer Installation & Activation

1. Run the SMSCaster setup package and complete installation.
2. Open software → Help → About → Copy Serial#.
3. Send Serial# to our support to get unlock key.
4. Enter unlock key to activate full bulk SMS functions.

4. Bulk SMS Sending Operation

1. Launch SMSCaster → Click Yes to auto-detect 16 COM ports.
2. Select ports marked Ready for SMS sending.
3. Import contact list (CSV/TXT) or create customer groups.
4. Edit SMS content → Click Send to Outbox.
5. Enter Outbox → Click Send to start bulk SMS delivery.

5. Advanced AT Command Operation (Putty)

1. Open Putty → Select Serial → Enter COM port & baud rate 115200.
2. Check IMEI: AT+CGSN
3. Modify IMEI: AT+EGMR=1,7,"IMEI_NUMBER"
4. Send USSD: AT+CUSD=1,"*XXXX#"
5. Enter PIN code: AT+CPIN="XXXX"

Ideal Application Scenarios

• Bulk SMS Marketing & PromotionBlast promotional SMS, discount alerts, new product launches for retail, hotel, restaurant, e-commerce industries.

• OTP & Security Verification SMSStable delivery of login verification, payment authentication, account protection SMS for websites, apps, systems.

• Enterprise Internal & Customer NotificationOrder updates, logistics alerts, bill reminders, device fault alarms, meeting notifications.

• Government & Public Welfare NotificationCommunity announcements, weather warnings, policy alerts, public safety notices.

• CRM System Customer EngagementMembership reminders, holiday blessings, after-sales follow-up, consumption record SMS.

• IoT & Remote Device AlertingFault notifications, status reports for industrial sensors, electric meters, water meters.

FAQ

Q1: Why can’t the PC recognize the 16 ports?

Q2: Why does the LED flash every 1 second?

Q3: Why does SMS sending fail after a period of time?

Q4: Can this modem work on 4G networks?

Why Choose YX 2G GSM 16 Port SMS Modem?

1. Medium-Scale Bulk SMS Specialized: 16 concurrent channels, perfect for medium-volume commercial SMS campaigns.
2. Genuine Quectel Modules: Stable signal, higher SMS success rate than ordinary modules.
3. 10-Minute Quick Setup: Complete driver + software + activation guide, no professional debugging needed.
4. Lifetime Technical Support: Free after-sales service for driver, software, and troubleshooting.
5. Cost-Effective Bulk SMS Solution: One-time investment, long-term low-cost SMS sending.

•  Free driver & SMSCaster software package
•  Official English user manual & activation support
•  1-year warranty & lifetime technical support
•  Global shipping

Contact customer service (GMT+8  9:00AM-18:00PM) for queries and want bulk price!

Whatsapp: +8615220722893
Emai: yx@yxinternet.com
Telegram: @YXwendy
Teams: yuexun@yx19999.net



For detailed product operation, please refer to the relevant manual or contact customer service for assistance

About Us

YX International is a professional supplier specializing in consumer electronics, smart devices, and lifestyle products. With years of experience in global trade and a strong supply chain network, we provide businesses and end-users with reliable products at factory-direct prices.

Our mission is to bridge quality manufacturing with global buyers, making cross-border sourcing easier, faster, and more transparent. From product selection to quality control, and from fast delivery to after-sales support, YX International ensures every order meets high expectations.

        

Why Choose Us

• Extensive Product Range：From smart electronics to innovative gadgets, we cover a wide range of categories to meet various market demands.
• Direct-from-Manufacturer Pricing：We work directly with reliable factories, ensuring competitive wholesale prices with no hidden costs.
• Strict Quality Control：Every product goes through multi-level quality checks, from factory audits to pre-shipment inspections, guaranteeing what you receive matches your expectations.
• Efficient Logistics Network：With global shipping partnerships, we offer fast and trackable delivery to over 100 countries, keeping your orders on time.
• Dedicated Customer Service：Our professional team is ready to support you before, during, and after your purchase, ensuring your sourcing experience is smooth and hassle-free.

FAQ

1.Who are we?

YX International is a trusted supplier offering consumer electronics, smart devices, connecting global buyers directly with high-quality factories.

2.How can we guarantee quality?

Factory audits to verify production capabilities

Product sampling and testing

Pre-shipment quality checks to confirm product specifications

3.What can you buy from us?

We offer a wide range of products, including:

SMS Modem

SMS Dongle

Voip gateway

SMS gateway
eSIM Gateway
IP Phone
Modules/Accessories

Customized products for bulk orders

4.Why should you buy from us instead of other suppliers?

Direct factory pricing with no middleman markup

Comprehensive quality control from production to delivery

Flexible order solutions for both retail and wholesale

Fast global shipping and reliable logistics

Dedicated after-sales support to resolve any issues

5.What services can we provide?

Product sourcing and customization

OEM and private label support

Product quality inspections

Global shipping coordination

After-sales support and warranty services

● 8/16/32/64 Ports
● 1 USB Serial Port
● 1 Power Interface (DC 5V,AC 100-240V)
● 1 Power Switch
● 8/16/32/64 Independent switch
● 8/16/32/64 SIM card slots
● 8/16/32/64 Antennas
● 8/16/32/64 LED lights

Speed: 2G: 800-1000 sms, 3G:2500-2800 sms, 4G:2500-3600 sms per port per hour Send and receive SMS,MMS

Input voltage: 100 to 240V
Working temperature: -20 to +60 degrees Celsius
Storage temperature: -25 to +70 degrees Celsius
Double tone multi-frequency function(DTMF)

5、Function

1. Directly connect to your computer, the main function depends on the software, such as SMS Caster which we provide for free (you can download it from our website and check the specific function):
   ● Support batch mass SMS, flash message, long SMS, MMS (need to have their own software support);
   ● Support importing contacts and importing messages directly (by importing forms);
   ● Support timed tasks, support auto-reply (need to set keywords);
   ● Support multi-task sending (send by port), support intermittent sending (you can set how many seconds to lock after sending how many);
   ● Export unfinished tasks, etc.
2. In addition to SMS-related functions, other features such as call, receive SMS, send USSD, change IMEI, etc. all need to be supported by other software or AT commands.we only provide AT command manual, do not provide other development support.
Remarks: Please check the product manual for other specific functions.

▼SMS Caster interface operation demonstration



6、FAQ
Q1. Does SMS modem support custom calling number/sender ID when making calls or sending text messages?
A：The device uses a SIM card, which naturally displays the SIM card number when making calls or sending text messages. This is determined by the SIM card itself and the SIM card operator, and generally does not support custom calling numbers/sender IDs. In VOIP and network SMS services, only the operator's routing (CLI and direct connection) may be supported!

Q2. Does SMS modem support detecting surrounding mobile phone information, listening to surrounding calls, tracking/tracing mobile phones/calls/SMS, IMSI Catcher and other detection functions?
A：This type of feature has no connection with our product and is not supported!

Q3. Does the SMS modem support wifi or multi wifi functions to provide data internet access and other functions?
A：The functions related to wifi/data internet are not related to any of our devices and are not supported!

Q4. Does GOIP, MOIP, or SMS modem support functions such as MMS, picture SMS, voice SMS, video calls, etc?
A：SMS modems can support MMS (customers need to have their own software support, we do not provide MMS software), and the latest version of YX GOIP/MOIP can also support sending MMS. Other products do not support it.

Q5. Does the modem have an API?

A：The modem does not have an API, while the YX series GOIP/MOIP has HTTP APIs for sending/receiving SMS and USSD, supporting customer developed software to call through HTTP; DBL's GOIP does not have an API that can be directly used, but if the customer has their own server, after installing a GOIP SMS sending server software, they can use the SMS HTTP API.

Q6. Is there a device that supports receiving and forwarding SMS messages?

A：SMS modem can receive SMS messages, but it does not support forwarding. At the same time, the software we provide does not support viewing which port receives SMS messages;YX GOIP/MOIP can receive information and forward it to email/HTTP address/SIP server/other phone numbers or HTTP API directly from the device (commonly used are email or HTTP API retrieval)

Q7. Can the device support international roaming and what should be noted?
A：1. The SIM card needs to be able to roam to the target country. 2. It is necessary to understand the frequency band of the target country, and the device needs to be matched with the frequency band of the target country (if there are too many frequency bands in the target country, it can also be determined which operator in the target country can provide roaming signals for the SIM card, and the device needs to be matched with the frequency band of the operator that provides roaming signals)

Q8. What is the SMS sending speed of the modem?
A：2G modem: 1500 per port per hour; 3G/4G modem: 3600 per port per hour (the above standard testing environment may vary depending on the device environment)

Q9. Modem be used in XX country (or a certain operator)?
A：The product is not related to which country or carrier it is used in. As long as the device's frequency band matches the local (or carrier's) frequency band, it can be used!

Q10. What is the difference between 2G/3G/4G devices?
A: 2G/3G/4G modem send SMS at different speeds, but there is no difference, but in many countries, GSM signal is facing elimination, so you need to choose according to the local situation

Q11. Can the modem send USSD?
A: No, it is not recommended, although the cat can send USSD through AT command, but this AT command relies on manual operation, there is no way to use it in large quantities directly, if the customer has its own software support then it is possible!

About IMEI,operators will recognize that one IMEI is one cell phone, so when the card is abnormal,it may be accompanied by IMEI being blocked, the phenomenon is usually that the device can not be registered or can not send SMS or can not make a call, etc., but the card inserted into the cell phone is normal, this is the case that the IMEI is blocked, and the IMEI can be replaced!