If you need to use one SIM for business and one to keep in touch with friends and loved ones, then a dual SIM phone is just the device for you. Most of these devices can keep both SIM cards in standby at the same time. That means, if someone calls you on either number, the phone will rings. When you what to make a call, you can select which number you want it to appear that you are calling from. Take advantage of the best deals from two different telecom companies for the different types of calls you make with a cheap dual SIM phone!