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Courier® M2M 3G GSM Intelligent Cellular Modem

PTCRB Carrier Approved, GSM/GPRS/EDGE/HSPA+ Speeds


Comprehensive Secure M2M Cellular Solution with Powerful Embedded Software

Comprehensive Secure M2M Cellular Solution with Powerful Embedded Software

Introducing the new USRobotics® Courier® M2M 3G Cellular modem, the latest in the Courier product line known around the world for its reliability, security and performance for mission critical applications. The intelligent terminal is ready to use out of the box on GSM HSPA+ global wireless networks with GPS capabilities and added powerful embedded software for easier programming, configuration, and customization. One configuration enables the option for persistent connectivity for M2M applications that require always-on bidirectional data transfers. With an extended working temperature range and compact size this reliable device is an ideal solution for M2M applications including remote maintenance & control, Point of Sale, environmental monitoring, transportation, automation, security systems, and Out of Band management. Carrier approved with full certifications, this device is ready for quick implementation, reducing customer costs significantly and lowering the entry barriers to a wide range of M2M solutions for an easier transition from analog to cellular.


Complete Solution*

  • Provisioned SIMs with MVNO partnerships already in place for qualified customers*
  • Simple and easy all-in-one billing for worldwide accounts
  • Access to worldwide carriers
  • Reduce costs with data pooling
  • User-to-modem connections with static IP addressing
  • Remote diagnostics for both the modem and the service

Powerful Embedded Software

  • Simplified programming speeds implementation & reduces time to market
  • Built in cellular network expertise that enables robust M2M solutions
  • Lower development costs

Global Approvals

  • PTCRB Approved
  • Safety and Regulatory Certifications - FCC, CE, IC, R&TTE

Cellular Networks

  • Penta-band 800/850/900/1900/2100 MHz
  • HSDPA packet data bandwidth up to 14.4 Mbps

Multiple interfaces

  • RS-232 (DB15) Serial
  • USB 2.0


  • Asset Tracking Capability

Courier Brand

  • Reliable modems you can trust
  • Business class - rock solid quality you can depend on


  • Encrypted cellular connections when combined with a network operator's Tunnel prevents eavesdropping and blocks unauthorized access*
  • User programmable warning banner

Simple User Interface

  • Familiar Command Line Interface
  • AT command compatible

Industrial Quality Design

  • Compact design ideal for branch offices with small IT closets or small off-site locations in need of remote management
  • Rugged aluminum housing for use in harsh conditions
  • Versatile mounting options

Advanced Features

  • Persistent and reliable connectivity ideal for remote management solutions
  • Remote configuration capability
  • Unlimited programmability with powerful high level AT commands versus complex C/C++ programming or scripting
  • Save time and effort with easy pre-programmed functions
  • Stand-alone operation for a smaller footprint and lower power consumption


Specifications & Standards


  • 1 USB 2.0 connection: Standard Mini USB Type B
  • 1 RS-232 connection: DB15-F
  • 1 SIM slot (1.8V/3V)
  • 1 Main Antenna Connection: 50 Ohm SMA female
  • 1 Diversity Antenna Connection: 50 Ohm SMA female
  • 1 GPS Antenna Connection: MMCX
  • Power Connector: 10 pin Micro-Fit™ socket
  • 2 GPIO Pins, AT command controlled
  • LED Network status indicator


  • Voltage range 4.75 to 32VDC
  • Transmit mode - 3.7A peak at 4.75V
  • Average current - 850mA at 4.75V
  • Low Power Mode, external trigger
  • Core Frequency: 480 MHz
  • Sleep Idle Mode average current - 0.78 mA
  • RTC backup battery

Radio Technology & Frequency Bands

  • HSPA+
  • 3G Penta-band 800, 850, 900, 1900, 2100 MHz
  • 2G 850, 900, 1800, 1900 MHz
  • Voice and Data support
  • HSDPA Packet Data up to 14.4 Mbps
  • SMS - Text & PDU, Point-to-Point (MT/MO), Cell broadcast


  • OTA encryption: A5/3 and A5/1


  • Embedded Standalone GPS
    • Tracking sensitivity: -155 dBm
    • Cold start sensitivity: -145 dBm
    • Hot start sensitivity: -155 dBm
    • Open sky TTFF: cold start < 45 second average
    • Open sky TTFF: super hot start < 3 second average
    • Open sky accuracy: <10m
  • NMEA sentences: GGA, GSA, GSV, RMC, VTG
  • Active GPS Antenna Bias

Courier M2M Open AT® Application

  • Bearer Management to stay connected
  • AT Commands over SMS or Telnet for remote diagnostics and configuration
  • Client and Server TCP or UDP Sockets
  • Email client with SMTP and POP support
  • Programmable warning banner
  • GPIO control
  • Programmable device management

Regulatory & Approvals

  • CE/R&TTE
  • EMC Compliance:
    • FCC Part 15 Class B
    • EN55022 Class B
    • EN55024
  • Radio compliance:
    • EN 301 489-1
    • EN 301 489-3
    • EN 301 489-7
    • EN301 489-24
    • FCC Part 22,24; RSS 132,133
  • Safety:
    • IEC 60950-1
  • Industry Canada/IC
  • Network: PTCRB
  • A-tick
  • RoHS Compliant
  • WEEE Compliant


  • Temperature conditions: Operating: -30 to 75° C, Non-Operating: -40 to 85° C

Enclosure Type

  • Industrial Grade Aluminum

Package Dimensions/Weight

  • 8.625 x 6.125 x 3.125 in. (22 x 15.6 x 8 cm)
  • 1.5 lb ( .68 kg)

Product Dimensions/Weight

  • 3.54 x 2.36 x 1.18 in. (90 x 60 x 30 mm)
  • .28 lb ( .125 kg)

Package Contents

  • USRobotics Courier M2M Cellular Modem
  • One (1) 2db SMA Penta-band Antenna
  • Universal power adapter 100 V — 240 V with UK, European, and US plugs
  • DB15 to DB9 Serial Cable (5 ft/1.5 m)
  • Two (2) Mounting bridles
  • Quick Installation Guide

Product Numbers

  • USR3500
  • USR3505-ATT AT&T SIM Card
  • USR3505-ROG Rogers SIM Card
  • USR3505-VOD Vodafone SIM Card
  • USR3505-ACT SIM Activation
  • USR3506-ACC Mobile Accessory Kit
  • USR3506-ETH Ethernet Expansion Kit


Accessory Kits

Accessory Kits

To order Accessory Kits contact USRobotics at 877-710-0884 or send us an email.

Ethernet Expansion Kit - USR3506-ETH

USR3506-ACC Etherent Accessory Kit
  • Ethernet Expansion Card
  • Backplate and spring contacts
  • RJ45 Interface Cable


Mobile Accessory Kit - USR3506-ACC

USR3506-ACC Mobile Accessory Kit
  • DC Cable
  • GPS Antenna
  • GSM Antenna

Support & Documentation

Transitioning from Analog to Cellular

Solution Partners

Activating SIMs and service

Support Page



Why can’t I use any cellular modem as a drop-in dial-up modem replacement?

Most cellular networks use a different type of technology that isn't compatible with dial-up analog systems. Our Whitepaper explains in detail the how's and why's but the high level answer is that most cellular data networks are packet based, rely on IP addresses, and are client/server whereas dial-up systems are peer-to-peer direct connection and rely on phone numbers which normally cannot communicate without additional hardware and/or software that could complicate how a solution works.

USRobotics does offer a unique solution that emulates a dial-up modem over a cellular connection that can allow a true drop-in solution. See the USRobotics Courier® Modemulator™ & Cellular Gateway for more information. 

Learn more with the Cellular to Cellular Data Communications White Paper

How much can I expect to save by replacing analog modems with cellular modems or gateways?

The cost of analog phone lines is on average $50 per month per line in North America. Cellular services when pooled can provide even greater cost savings with small data packages and low data volumes. The cost savings increase as the volume goes up, whereas the dial-up monthly expenses are consistent but pricey.

Can I use the SIM from my phone for a cellular modem or gateway?

Possibly. Depending on how your SIM is provisioned, it may allow a cellular modem or gateway to originate a connection to the IP address of a TCP/IP server on the Internet. If your SIM does work, you won’t have M2M features like static IP address, data pooling, peer-to-peer routing, or host-to-device VPN.

Can I connect to the IP address reported by the USR3500?

When the cellular service is provided by a Mobile Network Operator (MNO), the IP address reported by the USR3500 AT$IP command may be public and routable. Normally this IP address provided by the MNO will be dynamic so it will change periodically, and the MNO may block access to this IP address with a firewall.

When the cellular service is provided by a Mobile Virtual Network Operator (MVNO), the IP address reported by the USR3500 AT$IP command is not public and routable. The reported IP address is used only by the MVNO to contact the cellular network. The MVNO will translate the IP address using Network Address Translation (NAT) and provide you with a different routable IP address.  The USR3500 cannot report that IP address. The MVNO will control whether your IP address is private or public, and static or dynamic.

* Services dependent on MVNO partnership for qualified customers, subscriptions may be required.