Most recent iPhones come with dual SIM functionality, requiring users to choose a primary line to make outgoing calls. Setting up a primary line saves you from having to choose which SIM to use every time you want to make a call. In some cases, when you have dual SIM enabled on your iPhone, you may see the error message “Last Line No Longer Available” in the Phone app.
9 Ways to Fix Last Line No Longer Available on iPhone
If you are wondering what the error message "Last line no longer available" means and how to fix it, you can find more information in the following post.
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The "Last Line No Longer Available" error message appears when you try to make a call on your iPhone that has dual-SIM functionality. When you have two SIM cards installed in your iPhone, Apple suggests that you set one of the SIM cards as your primary line for making calls and sending messages. When that primary line becomes unavailable (due to network or account issues), iOS shows the "Last Line No Longer Available" error message and suggests that you place a call from your secondary line.
