lets make something a little clear. a phone is a physical device with a connection .. if you are getting something through your phone.. it is actual.. so SOMEONE physical is MESSING with you.
Imagination is a wonderful thing but also can be a leading astray.
sounds as if you are trying to convince yourself of something.
if you are losing spurts of time and light headed and confused check your diet. go see a doctor and have a check up to rule out physical issues.
do you take medications? has this happened before? has stuff in your life changed? how is your stress?
where do these messages on your phone come from? what you were saying is that they are from your boyfriend? to be honest it sounds as if he is messing with your head...
go out .. ground .. center.. do something that centers or relaxes you... THEN look at it again.
sounds like you are off kilter...
I'm kinda curious what they have been sending you. It might just be a malicious spirit who is pretending to be a "demon" too, don't forget. If you truly feel threatened, but up your shields and call in your guides. If you work with angels, call up on them (though everyone has guardian angels but some pagans are iffy with the angels).
The following books may interest you:
Sebitti: Mesopotamian Magick & Demonology
That's a very good suggestion, there, Phillip
It sounds like you've attracted the attention of something nasty, perhaps on the astral plane or your crystal work. The best way as far as I know from second hand experience of others, is to use humour or call on an angel such as the archangel michael, and just ask for his protection. This usually does the trick depending on how long this has been going on for. From your profile picture your very attractive, and it's not uncommon for young beautiful women to be plague by such entities in folklore, as you're a sexual magnet, with powerful inherent energies that you have to be careful with, abiding by the rules of the magic circle or bower you employ as part of your praxis.
I’m a little confused. Are you wanting to banish it, or make contact with it? If you want to banish it, there are a lot of banishing rituals available in books and on the Internet, and there’s always Dion Fortune’s classic Psychic Self-Defense. You don’t have to know who it is to banish it. However, if you want to make contact, you should know that not every entity out there is known or “named” in the way we think of naming. If you want a name for it, just ask it. Even if it’s not friendly there’s an old exorcist’s experiential rule that if you ask, it will tell you who it is. Of course, its never a “one true name” which isn’t something you could say or write down anyway, but it would give you a hint as to what you’re dealing with.