The layout of the Horton cabin changes for plot purposes. Sometimes it has a small bedroom, other times it's just one big room.
In the past, when cell phones were first getting popular, there was no service on Smith Island. Then as cell phone use became more widespread and nearly everybody had one, it was said service was spotty on the island. So either some enterprising individual managed to get a cell phone tower built on Smith Island, or maybe Chanel has satellite internet service on her tablet that people in rural areas can get now?