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most of the ones I tried didnt work. To be allowed to use an app to text means the phone carriers restrict those numbers leased within a special range that they know came from apps. Big tech companies have become savvy to which numbers fall within that range and then auto-reject them. The annoying bit is, even if you find an odd one that lets you go through, most of these apps will auto expire your access to that number after a couple months and you'll lose access to the number forever, then one day out of the fucking blue, twitter will won't log you in unless you can confirm the text they just sent, probably after your questionable tweets. Bye bye account. Burner phones bought paid cash are probably the quickest way in. But keep in mind, if anon is your goal, you can never use the twitter "app" on a phone. Just use a disposable phone to get registered and only log in through a secured linux OS running through the TOR network with at least 3 bounces. Tails, parrot OS, etc.

Build a droptop. Take an old shitty used laptop, rip out the hard drive. No need for storage on this. Put tails or bootable parrot on your usb keychain. This is your travel laptop. If it ever gets confiscated, it can't boot because there is no fucking hard drive, there's nothing stored to clean, every time you use it, its vapor, it was a temp boot on a secure OS and nothing could saved if it wanted too. Bonus points for hardware older than 2012, they had a lot less back doors. Pick up a usb wifi adapter with enlarged antennae to support 3ghz and 5ghz since the old shit wont have it built in.

Being a ghost requires learning linux. Mac, Windows and Android log everything you do and send telemetry data about you every few seconds. Even using pi-hole wont stop all their shenanigans. Learning to use linux is fun and will be more and more useful to know as time marches onward.

Idunno, but I did a search and this came up. I can't vouch for any of those, but it had not even occurred to me that such a service existed. It's a pretty good idea.

If you find one let me know