Is red LED light safe for the eyes?

I have an iPhone, and I have learned to apply a color filter which makes the ENTIRE screen display "red". Would this be safe for my eyes to use in the dark?

Iphone XS Max feels slow after update to IOS 13.1?

This is my first iPhone, I've had it for almost 2 weeks now, out of the box new. And since I got the IOS 13.1 beta 2 days ago, I'm on the beta program, my phone feels slower than before. Like a noticeable difference even when Low-Battery mode is not on. Is there something I can do about this? Btw this is not my first update under the beta.

How can I make my iPhone XR look like an iPhone 11?

I want to make people jealous at school but I can't afford a new phone, and I read the only difference externally between the iPhone XR and iPhone 11 is the dual camera lens so I want to get an iPhone 11 case and then print a picture of an iPhone camera and cut it out and tape it on my phone to make it look real and maybe use something to make it stick out, will this work? Any other ideas

Iphone Installment Plan?

Do I need to pay the carrier for service/data as well for the Iphone installment plan? I don't use service or data, so I would rather not pay for it, but would still rather pay for the iphone monthly.

Why is my iPhone delivering iMessages to an android?

I work at a phone store and a customer had an issue with her LG phone. Everyone that had an iPhone would send her a text and it would show up as "delivered iMessage" on their end, but she never receives the message. I tested it out with my phone and I would have to press and hold to "send as text message" before it would deliver in iMessage. She did say she had gotten her number changed recently so I assumed the number was still registered as an iPhone number. Would anyone know how to fix this issue?