While typing an email in Gmail on my smartphone (LG android) a young woman only a few feet away was reading what I was typing on her smartphone (it was as if the screen on my smartphone was available on her smartphone). For the sake of brevity, the details aren't important. I just want to know how is it possible (as in hacking) for her to be able to access what I am doing on my smartphone on her smartphone? The only thing she was privy to was my cell number. I have Lookout Security on my smartphone. Thanks for any info you can give me.
Software/Hardware used: LG G Stylo (android smartphone)