Gionee Elife S5.1 was one of the slimmest smartphones at the time of its release, measuring just 5.1mm in thickness. It offered a stylish design, decent performance, and a vibrant AMOLED display, making it a great option for users looking for a sleek and compact device. However, with limited RAM and storage, as well as the absence of 4G connectivity, it may not be suitable for heavy multitaskers or users requiring high-speed internet.