There’s an article out now with Apple saying they will support RCS by next year https://www.theverge.com/2023/11/16/23964171/apple-iphone-rcs-support

And before using a can of fresh air, look into an electronics fan. Compressed air doesn’t actually play nice with electronics

So I figured out a while ago there there’s an app called PdaNet+ along with Foxfi. It let’s you use your phones mobile connection instead of a hotspot to connect your external devices. It’s worked wonders for me and although I haven’t had to use it much due to unlimited data and access to wifi where I am, it’s useful if you aren’t in that situation. I believe the app key unlocker is about $8 but it’s worth it for the features it offers.