All four major U.S. carriers – AT&T Mobility, Verizon Wireless, Sprint and T-Mobile US – have filed letters with the federal government approving SureCall cell signal boosters for carrier-grade deployments.

SureCall announced on March 30 that the carriers have certified with the Federal Communications Commission that SureCall products meet manufacturing regulations; the final step in the FCC review process.

SureCall founder and CEO Hongtao Zhan said, “The significance of these filings cannot be overstated. This represents the acceptance of boosters as a safe and legal solution for improving cell reception, and it eliminates any concern dealers or end-users may have in installing them.”

The initial concern with cell signal boosters was that the devices may interfere with cellular towers.

In 2013, the FCC, working with carriers and manufacturers, adopted new guidelines designed to prevent network interference.

Carriers had until March to formally articulate any objections.

“The cellular landscape is better served because of the hard work of the industry’s players,” Zahn said, “and the beneficiaries will be the end-users who rely on the reception of their cellular devices to conduct so many of their daily routines.”

SureCall cell boosters, which essentially increase the range and reception associated with a cellular call or data transmission, are in use by several major companies including Chrysler, Hewlett-Packard, Exxon Mobile and Newell-Rubbermaid, along with federal entities like the U.S. Military and State Department.

SureCall technology is also employed by Stanford, Duke and Wake Forest universities.