When you leave to do fieldwork, you never take the fragile slab of glass that you call your smartphone. On the job site, you carry the rugged and reliable Casio G'zOne Ravine. It is a 3G flip phone that works on Verizon's network. Your Casio Ravine is made for the outdoors. It has survived a tumble down an actual ravine and several baths in rivers and lakes, and it was even chewed by an angry dog. Although it is sturdy enough to take a beating and still keep ticking, your Ravine dies too early these days. What it needs is a new Casio G'zOne Ravine battery. Alternatively, you can upgrade to a Casio Ravine 2. This is also a flip phone with a very similar set of features as the original Ravine; however, its display is sharper, and it supports microSD memory cards. You can find both Casio G'zOne Ravine cell phones, as well as accessories, among the wide selection of electronics offered by reputable sellers on eBay.