H2O 3-in-1 SIM Card H2O Wireless 3-in-1 (Triple) SIM Card is an All-in-One solution for your no contract wireless service needs. This can be used as a standard-sized SIM, a Micro-sized SIM or a Nano-sized SIM card. Compatible with all smartphones such as Samsung Galaxy series, HTC, LG, and all Apple iPhones. Smart Technology - automatically configures H2O data settings once plugged into your phone. Direct Dialing - unlimited international calling comes with many of H2O Wireless' plans and direct dialing feature eliminates you from memorizing your H2O international calling access number and then its PIN number as all of that is already pre-programmed on the SIM. Competitive plans - unlimited data plans starting at $35/month.