The question isn’t who exclusively has a landline, or why OP needs to call a landline. They’ve stated that they need to be able to call a landline: It’s safe to assume that they are aware of the existence of smartphones and internet-based calling services, and have concluded that it doesn’t serve their needs, which is why they’re asking for help calling a landline. Responding that they don’t need to call a landline reads like the classic stackoverflow response of “you don’t need to do <thing the question asks how to do>”.
The question isn’t who exclusively has a landline, or why OP needs to call a landline. They’ve stated that they need to be able to call a landline: It’s safe to assume that they are aware of the existence of smartphones and internet-based calling services, and have concluded that it doesn’t serve their needs, which is why they’re asking for help calling a landline. Responding that they don’t need to call a landline reads like the classic stackoverflow response of “you don’t need to do <thing the question asks how to do>”.