Ring, ring. Who’s there?

Just the Dolphins’ stud new receiver — already hard at work justifying his $60 million contract.

Time will tell if Mike Wallace is the savior of Miami’s sluggish offense, but he’s already a godsend to the team’s marketing department. In his first full day as a Miami Dolphin, Wallace was everywhere — appearing on NFL Network, taping a phone message for season-ticket holders and giving away a signed hat on social media.

For a team that has run an enthusiasm deficit, he’s adrenaline in a bottle.

“It took forever just for this last week to pass, but I’m very excited to be here,” Wallace told reporters during his introductory news conference Wednesday. “I’m very excited to start this next chapter in my life down in South Florida.”

That chapter could include a whole new cast of Dolphins characters.

Tight end Dustin Keller was also in town Wednesday, on a free agent visit. After a physical in the afternoon, he met with coaches before a dinner on the town.

Keller, who spent his first five seasons with the Jets, had 28 catches for 317 yards and two touchdowns in an injury-shortened 2012.