Models of similar design, and technical characteristics of devices are not very different. M2310 was made in a folding form factor, M2710 - slider. It seems that both models are simpler versions of a music phone with a DJ-capacity Samsung M7600 BEAT DJ.
Specifications Samsung M2710:
Networks: GPRS / EDGE
Camera: 2 MP
Memory: Slot for memory cards format microSD
Feature Mobile Tracker (helps you find a lost or stolen phone)
3.5 mm jack