Yes, but none that offer the convenience or modern technology of mobile phones. If you’re looking for eco-friendly alternatives to a mobile phone, HAM radio, walkie-talkies, and family radio service are your best options. Walkie-talkies and family radio services offer a limited range, making it difficult to communicate with people further than 1.5 kilometres.
HAM radios, on the other hand, are regulated by the Federal Communications Commission, and you need a licence to operate one. However, they’re easy to purchase, and you can use them to call people all over the world.