Yes, you have internet access at Mardi Himal trek. Furthermore, you can also find 3G mobile phone coverage on the trail. So, you can now make video calls and you can also surf the internet on Ncell and NTC mobile phones. Sim cards are available in Kathmandu and Pokhara. You can charge the camera battery, phone at the lower places and at high camp they have solar power. But they will charge a fee for charging a battery, wifi, hot shower etc.