From the article on Device Ace:

The nano-antenna was created from a 25-micron CNT fiber, transparent tape, and silver paste,
then the researchers replaced a cellphone’s antenna with the “nantenna”. According
to Professor David Mast, from UC’s McMicken College of Arts and Sciences, the cellphone got
four to five bars of signal using the nantenna that his fellow researchers created.

This is a great example of how technology keys getting smaller in leaps in bounds. With advances like these it won’t be long before we have internet enabled chips small enough to embed in our brains!