Quick meaning
A phone with two SIM card slots, allowing you to use two phone numbers or networks simultaneously.
Think of it like this
Like having two doorbells on one house — people can reach you two different ways.
Where you may see this
You may hear this when buying a device, asking for repairs, or checking phone and computer settings.
Why it matters
Understanding the hardware term helps you choose the right device and explain problems more clearly when asking for help.
Say it simply
Dual SIM means: A phone with two SIM card slots, allowing you to use two phone numbers or networks simultaneously.