Hi panda (going to go for Lynda's shortening of your user name from the other post)
there are a lot of phal hybrids out there. And they quite often end up looking alike. I can think of two off the top of my head that are white with red lips: Happy Girl and Su's Red Lip.
I'm afraid that, when there's no tag, to find out the hybrid you would probably need to ask the seller and then maybe their supplier. Otherwise you will never know. I personally can't resist a pretty NOID (although I did today - and the plant even had a basal keiki... I wonder if the shop is still open??).
Enjoy the plant!