Speaking Saturday after his first official practice with the Heat, Allen said he was disappointed at Garnett's sentiment.
"That's a shame," Allen said. "I'm a good person to talk to on the phone. ... I've been in weird trade situations the last few years. You always felt you had one foot in and one foot out, so I can't worry about it."
Allen signed a two-year deal with Miami for just a little more than $6 million, spurning an offer from Boston that was believed to be worth twice as much.
"I don't have Ray's number anymore," Garnett said Friday. "I'm not trying to communicate. I'm just being honest with everybody in here. ... It's just what it is."
Garnett had lobbied Allen aggressively over the summer when Allen was making a decision.
"I don't know how many miles apart we are, sometimes the translation gets messed up," Allen said. "We're friends regardless of what happens. He's got to do what he's got to do up in Boston."
Allen's new teammates, of course, were offering support.
"(Garnett) doesn't need to be talking to our team anyway, so it's all good," Dwyane Wade said. "(Allen) doesn't look too bad in a Heat uniform. At first it was weird but now I'm getting used to it."
The Heat host the Celtics to open the season on Oct. 30.