There are four total Radio Call Documents in the game.
Lara. Lara. Laaaaara. Answer me. Last time I saw you, you were... damn it, Lara, you better not be dead.
After the Avalanche, I got one little blip. One brief echo, but I'll be damned if it wasn't your voice. I know I heard it. I know you survived. At least the avalanche. I haven't heard a peep since. But I'll keep trying. I know you told me to leave, to get somewhere safe, but... did you really expect me to leave you here? Come on, you should know me better than that.
An intercepted radio transmission from Jonah. Trinity must have been monitoring him as he followed me into the valley...
I don't know if you're reading me, Lara. But I'm going to keep trying. Something's out here. Climbed a tree to get a better view of the valley below - I can see old buildings and some activity. Looks like they got choppers and they're bringing in all kinds of equipment. It's got to be Trinity, it's the only explanation. Looks like they beat us to the punch after all, eh?
I've been watching for the past few hours, taking notes of their patrols. I think I can slip by them, if I time it right. You were always better than me at this...
If you're out there and you can hear me... please... be careful.
He made it all the way down to the facility... I should have expected. Stay safe, Jonah.
Got up close this time. Figured when I find you, maybe I'll have learned something that will help. Here's what I know. There's an operation here. Something big. hundreds of nasty looking soldiers, no insignia, no nothing, all holed up in this old Russian facility - Looks like it was once one of those awful Gulag prisons. I came down here thinking you needed me Lara, but Christ, how backwards is that? Before too long, I might be the one who needs rescuing.
I hope to God you're still alive and can hear this. I'll stay out of sight as long as I can, but it's getting pretty damned cold out here. I'm gonna have to find some kind of shelter soon.
Oh dammit Jonah. what the hell did you get into?
Lara, thank god, I think i found your tracks. I knew you were alive. It would take more than a thousands of tons of ice and snow to take out my Little Bird.
There's something strange going on in the woods and it's not Trinity. There's someone else watching me, from the trees. I had some food in my pack, old energy bars mostly, but I'm running low. Slept inside a dead log last night, and when I woke up this morning, there was... a present waiting for me. Dried meat, and some berries, all wrapped up in a deerskin. I thought I was dreaming at first, but... there's someone looking out for me here. Hope they're looking out for you too...
Someone was keeping watch on Jonah. Jacob's people must have known he was no threat to them...