OMG REALLY?
I am from Kenya if You Guys Would Like to Meet hehe, Best Advice I could give you guys is to carry warm clothes, and also, brace yourselves for an amazing experience. Whoop.!!

Edit;
I think you will make it to the 5th day lol, however, I do think the internet connection shouldn't be a problem, we have Safaricom which serves the enire East Africa and it's pretty good network, I do however know TZ has other local internet/cell providers so it shouldn't be a hassle.

Why Don't You Guys Stop By Kenya for a Maasai Mara Tour? hehe, also, I think it is the Wildbeest Migration Season So You Guys are in luck!!

What Activities are you guys looking forward to engaging in when there? Tanzanians Speak alot of Swahili compared to other East African Countries.

Happy Travels to you Guys. :))))