Brainphone is languages, Pen points out.

My dad'll learn yours. Won't even take him very long.

Okay, I try.

[Hi?]

He hears it. It's the first voice he's heard in hundreds of years, and he doesn't understand it, but he hears it, and -

[Hello?]

[Hi am Pen, one your sons saying I trying talk to you by brainphone because you just sort of over there, he say you learning my language, sorry am not very good at.]

It work!

Eru. Oh, thank you. Just keep talking, he'll start picking more up.

And on the other end - 

[Am Pen? One your sons saying I trying talk to you by brainphone because you just sort of over there, he say you learning my language, sorry am not very good at.]

[You not Pen, I Pen. And am eight not having any sons that be weird. And you learning my language not your language, not having wishes here so am just doing the brainphoney thing except is not really brainphone because is not languages and is not getting across ocean I guess?]

[You Pen, I not Pen? I learning your language. You not learning my language. Not having wishes here? doing the brainphoney thing? is not getting across ocean I guess?]

[You learning fast,] she comments. [Yeah not have wishes because am too little. Brainphone made by wishing but I just already have it when I go here. The thing that like the brainphone but not can't go Mandos? Brainphone can!]

[I learning fast. You Pen. I Fëanáro. not have wishes because am too little? I go here? I can't go here? You can't go Mandos?]

[Hi Fëanáro! You not having wishes because nobody giving you any, but when I bigger I getting some. You over there, I think you can't go here because you dead and not have body? And I not flying across whole ocean, yikes, and also am not Elf, am angel. And if I dying I torch. So I so not going there.]

[Hi Pen. I not having wishes. I over here, you over there. I dead and not have body?]

[That what your son saying, yeah. It sound really uncomfy, is it?]

[I learning your language, am not very good at. son? saying? yeah? uncomfy?]

[Um oh! Brainphone do pictures.] She sends him one of Tyelcormo.

[Oh! Son! Tyelcormo is son?]

[Yeah, he saying "brainphone my father" and I say "okay but brainphone is languages" and he say you learn mine.]

[I learn your language. Tyelcormo say I learn your language? I learn fast. I saying Tyelcormo father.]

[Yeah he say that. So fast wow.]

[I say Tyelcormo wow. Tyelcormo not dead.]

[Yeah he alive and he have a magic dog!]

[Say Tyelcormo father say wow?]

[...huh?]

[Tyelcormo not having brainphone, Tyelcormo not having wishes, Tyelcormo and magic dog brainphone with you? Say Tyelcormo, Fëanáro say wow.]

[I not put him on brainphone. I put, um, forget name... but not Tyelcormo. But he here! I say that.] He say wow.