Unknown number ended up being Nick Frost's Wallabies call up from Dave Rennie

On the other end of the phone was Wallabies coach Dave Rennie calling him into the national side's camp in the Gold Coast.

"I didn't even have his number saved," Frost said.

"I just picked it up thinking it was a random number, I was about to leave the house and then he said 'it's Dave Rennie' on the phone.

"I was obviously pretty shocked."

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The Wallabies camp call up was the first for the ACT Brumbies player, having made his Super Rugby debut in 2020.

Despite representing Australia at a junior level, the 21-year-old said he was not expecting the senior call up a few days ago.

"Obviously it's just a start making a squad but ... it didn't really sink in until ... you're in camp and you start training," he said.

"It's been good fun, [seeing] pretty familiar faces, with a lot of the Brumbies boys here, it's great and even just other guys ... you play against week in, week out, and get to know them, so it's been pretty good, everyone's pretty welcoming."

Frost is one of 15 Brumbies players in the 42 player squad, alongside Darcy Swain and Noah Lolesio who took their opportunity in the last national camp to step up and secure starting spots in the French Tests.

The second rower said it had been awesome to see Lolesio and Swain put on a Wallabies jersey and "kill it".

"It gives you confidence as well, because obviously you know how they play and whatnot," he said.

"It's a definitely noticeable step up, but it's not been a massive leap, which gives yourself a bit of confidence but I'm two days in and obviously [there's] a lot more ahead of us."

Brumbies coach, and Wallabies assistant coach, Dan McKellar visited Frost a few days after the former Knox Grammar student was called into the national camp.

"He's been his normal self," Frost said.

"He came in a few days later, back down in Canberra, and just shook my hand and congratulated me. He said 'just do what you normally do in training and go enjoy it'."