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USB Hotspot Design Type Mobile Broadband Form Factor USB Stick Height 3.3" Width 1.2" Depth 0.56" Weight 1.05 oz Color Black and Green Signal Indicator Indicator Connected to computer and detected network: Blue Systems Supported Compatibility Mac OS, WIndows OS Networks Frequencies Tri-Band Data Speed 3G (EVDO REV0, REVA) & 1X Connectivity Wi-Fi No
Check out the latest support materials here for your device.
Download user manuals, read FAQs, and upgrade your device's software.
Need Warranty Support?
For warranty support of your Cricket device, please contact Cricket directly at:
1-800-CRICKET (274-2538) or 611 from your phone
or go toExpand All |Collapse All
Is the modem compatible with Apple Mac?Yes, the USB modem is compatible with Apple Mac computers with both PowerPC and Intel Processors running MacOS10.4.11to 10.6.3.
What types of computers is the AC3781 modem compatible with?The quality of the AC3781USB Modem supports main prevailing types of laptops or portable computer, such as HP, IBM, Toshiba, Lenovo, Dell, Sony, etc.
How to activate the device after insertingInsert the device. If the device is not activated, Click Cricket Broadband AC3781 to run the Connection Manager and the following dialogue box will be displayed: “Device is Not activated, Do you want to activate now?” Click “Activate” to active the device. After selecting Activate, the Connection Manager will start the activation process. After the activation is complete, you will be prompted to reset the device. Click OK and wait for the device to be reset (power cycled). Use the Connection Manager to connect to the web, send messages, etc.
Can I send SMS messages using the USB Modem?Yes, simply open the application and select the Envelope icon at the bottom of the screen.
I get a notification, Message sent failed, what should I do?The network is busy and other reasons. Solution:Try later.Expand All |Collapse All
What’s the capacity does microSD card support of AC3781?The maximum supported capacity is 32GB.Expand All |Collapse All
When the Modem is being installed, the notebook cannot find it1) The installation programs of the USB modem haven't been installed properly Solution:Run the installation program, then connect the modem. If you use the Win XP operating system, install the drivers according to the Windows indication information to operate. 2) The modem isn't connected well Solution:Restart the computer, or connect the modem again.
When opening the connection, a Firewall Security Alert appears, what should I do?In order for the AC3781 software to work correctly, it must be allowed to connect through your firewall. Select the appropriate option for example Allow, unblock or Permit. If you require further information on how to configure your firewall to allow this application please contact the vendor of your firewall software.
The modem reports that it’s connecting at 3.1 Mbps, is this the true speed?This message displays the Maximum connection speed of the device and not the actual Connection speed. A number of different factors, including signal Strength,3Gor Signal, and current network traffic can affect the actual speed you are receiving. To confirm your actual speed try searching the Internet for a broadband speed test.
Why did my data connection fail?You are in the place where noCDMA 1X/ CDMA 1XEV-DOnetwork covered, such as underground parking lot, tunnel etc. Solution:Change to the place where having good signal. 2) The network at this time in this place is busy now. Solution:Try later. 3) The modem data is error. Solution:It is perhaps the network problem and please contact with the local supplier in time.
After restarted computer, there’s no signal all the time, why is that?You are in the place where noCDMA 1X/ CDMA 1XEV-DOnetwork covered, such as underground parking lot, tunnel etc. Solution:Change to the place where having good signal 2) The modem isn't connected well. Solution:Pull out and insert the modem cable safely again. The position of the USB modem inner antenna is unfitting. Solution:Adjust the angle of the USB modem inner antenna.Expand All |Collapse All
Software & Apps
What are the minimum requirements needed to run the software?The Minimum System requirements are as follows: - Windows® 2000 SP4 - Windows XP SP1 to SP3 - Windows Vista™ (32 bit & 64 bit) - Windows® 7 (32 bit & 64 bit) - Mac OS10.4.11to 10.6.3 (32 bit & 64 bit) Configuration (Recommended)： - CPU Pentium-IV/1GHz - Hard Disk 16 GB (used for installation of application) - RAM1 GB - USB interface2.0 (USB1.0 and 1.1 compatible)
No CD in the Box, how can I install the Software?Windows OS:
- Please connect the modem to the PC via the USB interface. You may use the optional data cable to allow optimal positioning to improve performance in marginal coverage areas.
- Please connect the modem to the Mac via the USB interface. You may use the optional data cable to allow optimal positioning to improve performance in marginal coverage areas.
- ClickCricketicon on the desktop.
- Clickicon and run the Setup file.
After inserting the Modem to Vista or Windows 7 , it warns that an unidentified program access. What should I do?Windows Vista and Windows 7 contains Enhanced Security Features, which warn you when any application attempts to install. Please Select Allow to begin the Software installation.
Why the installation program won't not run automatically?The system configuration is not suitable for the auto-run, Open the visual disc of the modem program and start the autorun.exe. If you have installed the other version of installation program please uninstall it firstly.
After full installation, what if the system doesn't install the driver properly?Please install the driver program manually. The driver program can be found in the installation address.
ManualsCricket AC3781 User Guide (English - DOC - 765KB)
Software UpdatesNo updates are available at this time.
Contact SupportIf you have questions about how to use ZTE mobile devices or your device needs repair services, please contact our services hotline or email for more information.Service Hotline: 877-817-1759
Hotline Hours: Monday-Sunday 8am - 9pm (CST)Live ChatEmail ZTE