IAN
When Ian calls you he always has to say "his well known memes" as a greeting. You would return with another meme, smiling to the point it hurt. It would annoy the hell out of you sometimes, that would just motivate him to do it more often.
MAX
When he calls you he's always so awkward and can't come up with an introduction. He would probably stretch his words and you knew his face would heat up. He always found a phone call with you awkward for some damn reason. You would giggle at his misfortunes of it and he would get so annoyed.
JOJI
Sometimes, to annoy you, he would yell into the phone with his Frank voice. You would yell back at him, causing you both to break out into laughter. Hearing his laugh is amazing for some reason to you! Once Joji realized how much you loved his laugh he would make fun you for it, "what are you fucking gay?". He would say in his Frank voice.