Handle calls on both SIM cards Dual SIM smartphones come with many advantages. They allow you to separate work from play – and handle your calls more cost-efficiently. With our new dual SIM feature, you can keep both SIM cards active at all times – meaning that you can talk on one SIM, and still receive calls on the other, instead of going to voicemail. This gives you the option of putting the first call on hold while answering the one coming in. And as a result, you’ll never miss a call.Now my question is sim 2 caller will see waiting at a time while i m talking with sim 1??????