Can I check in with my iPhone for southwest airline?

I have a flight to Dallas from NY this Friday & I know you're suppose to check in 24 hours before the flight, however I will be at work exactly 24 hours before it & I really don't want any bad seats… So I prefer to do it as soon as they allow us. I have an iPhone 6+. Iv heard there's a south west app as well from where you can check in but can I print my boarding pass at home later on then? Or do I show them the boarding pass from my phone at the airport? Never flew with south west before

You can check in with the app.
You can either use the phone app for a boarding pass, or you can re-print a paper one when you get to the airport or at home (that won't change your place in line). If you are checking a bag, you should get a paper one at the airport as well.

Yes you can check in on your iphone. You can also check on your phone and print your boarding pass at home, or print it at the airport, or you can probably just have the boarding pass on your phone and show it to them. I sort of think its better to just print out the boarding pass instead of having it on your phone because security checks the pass too and I don't really know if you want them touching your phone. You can download the southwest app too, or just open up your web browser, go to southwest.com and check in from there.