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Cellphone-Mate SureCall Wireless Amplifier for AT&T/US Celluar 4G LTE - CM700A-70 [700Amhz ONLY] - DISCONTINUED

No Longer Available

Item Number: 3386



Sales Tax (?):

$0.00 tax collected outside of Illinois


This amplifier has been discontinued. See our other building amplifiers

Fast Facts About This Product:

  • This amplifier is best for: AT&T and US Cellular4G LTE users looking for a powerful wireless amplifier to provide boosted signal to multiple LTE devices in a large home/office and have the space to accommodate significant separation between the antennas (60' of separation between the external and internal antennas is recommended). This amp is ONLY appropriate if you are ONLY needing to boost signal to AT&T or US Cellular 4G LTE devices (it will not affect 2G or 3G signal or 4G signal for other carriers, nor will it work for Verizon LTE - click here for the Verizon version of this amp)
  • Coverage area*: 4,000 - 10,000 square feet
  • All-in-One Kit? NO - antennas and cabling are required (sold separately)
  • Compatibility: AT&T and US Cellular 4G LTE ONLY!

IMPORTANT SIGNAL INFORMATION: If you're purchasing an amplifier for use at one specific location, we strongly recommend doing a site survey first to determine whether the amplifier will help you and to give you an idea of what kind of results you can expect from it.

If your signal is extremely poor (-108db or worse), an amplifier may not be effective - there must be some usable signal available for the amplifier to boost. Conversely, if the signal is too STRONG at your location (-50db or better), the amplifier may shut down to avoid interference with the tower.

The SureCall® CM700A 70dB amplifier is dedicated to improving data service on the AT&T LTE network. This amplifier is designed for large homes, offices and warehouses (2000 – 30,000 sq. ft.) operating on the LTE 4G frequency where users currently are not getting a strong 4G signal due to geographic location, building materials or structural design.

How it works: The outside antenna (sold separately) picks up the cellular signal and sends it through a cable (sold separately) to the amplifier. The signal is then boosted and sent through a cable (sold separately) to the inside antenna (sold separately), which rebroadcasts the boosted signal. All of your modems/phones within range of the inside antenna can benefit from the boosted signal wirelessly.

*Many factors will influence the actual coverage area you will see from a repeater, including layout/floorplan, construction, and original un-amplified signal strength. Depending on your situation, you may see more or less coverage than the estimates listed here. It is not possible to guarantee coverage area.

Installation diagram:

not to scale. representative graphic only. amplifier does NOT include cabling or antennas.

Installation notes:

  • In order for your system to function properly, you must maintain adequate separation between the outside and inside antennas (if the antennas are too close together, there will be oscillation/feedback between the antennas and the amplifier will shut down). This amplifier requires approximately 60' of separation between the outside and inside antennas (if you are using an omnidirectional antenna as the outside antenna, you will need more separation than directional antenna users will need). Separation can be horizontal or vertical.
  • If you cannot achieve adequate separation to eliminate oscillation, you can turn down the gain on the amplifier, but that will result in a smaller coverage area from the amplifier.
  • The interior antenna should be at least 10' away from the amplifier.
  • If you are using a panel antenna as the interior antenna, make sure it is aimed AWAY from the outside antenna.
  • For more details, you can download the installation manual (PDF)


  • Single Band 700 MHz – (AT&T and US Cellular LTE 4G Band)
  • 70 dB Gain
  • Automatic Level Control to help prevent overload
  • Adjustable gain
  • Sophisticated power control ensures output power is 3 watts maximum (max allowed by FCC)

Package includes:

  • CM700A Amplifier
  • 6V AC Power Supply
  • User Manual
  • Velcro and screw mounting kit


  • Frequency: 746-760mhz
  • Input Impedance: 50ohm
  • Gain: 70db-75db
  • VSWR: ≤2:1
  • Standard Supported: LTE
  • AC Power Transformer: Input AC110V, 60Hz; Output: DC9V
  • Maximum RF Output Power: 3Watts EIRP
  • Noise Figure: 5db
  • Connectors: N Female
  • Power Consumption: <9W
  • Dimensions: 6"x4"x2"
  • Weight: 1 lb 13 oz
  • FCC approval: FCC ID RSNCM700V

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Only customers who bought this item from 3Gstore can write a review - these are all verified 3Gstore purchases

Date Added: 08/30/2013 by Milt H. (Camino, CA)
My signal strength had a significant improvement. From the -84 to -98 dBm range (and worse), and now is a consistent -58 dBm. As an added note, with my Omni directly connected to my USB modem (amp turned off), the signal strength was between -68 to -84 dBm (after AT&T got their 4G tower back up)

The amp is connected to an Omni 9.5" CM228W external antenna, an internal CM248W antenna using LMR240 cables, and a Lightning Surge Protector (859902). I have an AT&T 313U Momentum USB modem connected to a Cradlepoint MBR95 wireless router.

I have been purchasing all of my networking equipment from the 3Gstore since November 2011, mainly because of their excellent sales and technical support!

Getting the amp to this point was challenging and took over two weeks, as mentioned below). I was ready to through in the towel several times had it not been for Valerie's patience and assistance.

If you have setup issues, and you suspect any wireless connection problems, then I recommend being persistent in your calls with your carrier to get needed answers. My symptom was the modem resetting/recycling itself about every 2-3 minutes. I was told by some that this is 'normal', and others that they could not see any connectivity issues, etc.. Then finally I spoke with a technician after several calls that informed me that I most likely was being plagued with cell tower issues, as their 4G tower was undergoing maintenance, and that could be the cause of the modem resetting. In the meantime, my circumvention was to use my 4" magnetic antenna to pickup a 3G signal.

Milt H, Camino, CA

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 We recommend downloading the installation manual (pdf) before ordering.

CM700 guide Download installation guide/manual
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