The telepathy thing is real. Like genuinely hearing their voice in your head or feeling this urge to text them that comes out of nowhere. I’ve had it happen where I pick up my phone to message them and they’ve literally just messaged me first. Or I’ll be thinking about them intensely and then run into something that reminds me of them - a song, a word, something they used to say.
Dreams about your twin flame are another big sign. Vivid dreams where they show up, and it feels so real, you wake up disoriented. Sometimes you share dream themes without knowing it. This happens more during separation, apparently, because the 3D block isn’t there when you sleep. You’ll see numbers that mean something to both of you, hear songs that were ‘your’ songs, and notice particular words or scenarios that keep coming up. Some people get feathers, particularly white ones, showing up in odd places.
I do agree that the biggest thing to look for is just… feeling their presence when they’re not physically there. That gut sense that they’re close or thinking about you. Hard to describe, but you just know. It can take a little bit of time (and journaling) but once you spot it… it doesn’t ever stop.