Today every smartphone, except for few high end ones, come with the dual SIM feature, however, there is a catch. If you are looking for a dual SIM handset for daily use, make sure that it is not a dual standby handset. What this term means is that when you are not using the handset, both SIM cards are active at the same time. However, as soon as you receive a call on one SIM, the other will become dormant and people calling on it will get the message that the number is not reachable. This might not be an ideal scenario for those who want both numbers to be active.