Yes, a smartphone can work without a SIM card if it is connected to a Wi-Fi network as it can route its calls through that network. We have used our old Samsung phone to test the working of each detail mentioned.
Most of the Android-based apps need an active phone number to create and authenticate the Google account. After verification, the SIM can be removed as the apps do not require a SIM card or a service plan to functions seamlessly.
A SIM card holds the International Mobile Subscriber Identity or IMSI. It identifies the user in the operator’s network and authenticates the user with the cellular service provider.
It then establishes the location of the user, and stores it in the operator’s Home Location Register – HLR. It is the main database of permanent subscriber information for a mobile network.
If the call is not being routed through the operator’s network then a SIM card is not required. For example, a Wi-Fi call is not routed through the operator’s network.
Please note that SIM card is part of GSM-based networks. Those of you who are still using the CDMA network, may not have a SIM card in your handset.
Now let us take a look at how to use a smartphone without a SIM, or an active cell phone plan. These tips are also handy if your phone is not getting enough signal strength. As long as you are near a local Wi-Fi connection, you can use your smartphone to:
- Communicate via Skype, Hangouts
- Use Facebook Messenger
- Make Skype, Whatsapp, or Viber calls
- Have Group/Video Chats
- Download or listen to music
- Download or watch movies and videos
- Download and play games
- Send receive emails
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