Last Line No longer available??

Hello Missystp,

Thank you for posting in the Apple Support Communities and for reviewing the related article About iOS 15 Updates. We’ll do everything we can to help with your iPhone.

Do you have, or ever have two lines active at the same time? The Apple Support article below provides more details:

Using Dual SIM with an eSIM

Also, do you see a cellular update? To check, tap on Settings > General > About. If an update is available, a prompt will appear there. Sometimes your cellular provider releases a cellular update to fix or enhance certain features. Learn more here:

Manually update your carrier settings on your iPhone or iPad

From there, let's be sure the device is fully updated since Apple fixes are included with each update. If an update is available, we suggest having a current backup to iCloud or to a computer.

How to back up your iPhone, iPad, and iPod touch

Update your iPhone, iPad, or iPod touch

Let us know if this helps, or if you have further questions.

Kind regards.

None of this is fixing the problem just updated my phone last nihht