He thinks it could be a good idea for someone such as Facebook because the company doesn't have to build a network and can instead work through wireless carriers like Sprint.
"What Facebook brings to the party is what they do. They are good at branding and marketing and doing what they do around social media," Carter said in an interview with "Closing Bell."
"They don't have to take on all the infrasructure. There are other enablers out there like Sprint that can provide companies like Facebook an opportunity to easily enter into the mobile category."
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As for Google, what it brings to the table is its great brand name, Carter noted.
"Google's entry quite frankly probably creates an opportunity for a fresh face to come into this industry and provide a different kind of model, a different kind of behavior. Google doesn't have the baggage of the other carriers," he said.
Google's new service will cost $20 a month, plus $10 per gigabyte of data used. Customers will get money back for unused data.
Whether Google offers better pricing, a new consumer experience or other devices, "they can create a new narrative in the marketplace," Carter said.
—Reuters contributed to this report.