verykool s5510 (Yellow) - Unlocked Cell Phones - Retail Packaging - Yellow The s5510 features 4G HSPA (21 Mbps DL, 5.76 Mbps UL) The s5510 Juno runs on the popular Android 4.4 KitKat operating system! The s5510 Juno allows fast multitasking thanks to its 1.2GHz Dual-Core processor.