Is it bad when you don't say who's this to a girl you havnt talked to in a while?

Ok so this girl texted me and I lost her number a while ago when I lost my galaxy but when she texted me on my iphone I kind of knew who it was so I didn't ask who's this cause I knew but I then she stopped texting me through when I texted her through IMessage Is it bad when you don t say who s this to a girl you havnt talked to in a while

Just turn your I'm off, then try to message her

Just ask her. She wants the d