There are a few internet cafes in Lukla, Namache and a few villages up to Gorak Shep. They are affordable but not completely reliable. You can connect with yours relatives through satellite phones. Some tea house offer satellite or wired phone service. Just point the device mostly east. It is an easy and inexpensive way to letting those back home know where you are and you are ok. Mobile phone service is available with a Nepal Cell phone company SIM card. They work perfectly well even outside the cities. However, as you go higher, you will lose the strength of the network or have no network at all.