Do the cops check phone records after a person commits suicide?

[Iamxoable]

I just want to know of the cops check phone records, last sent messages after a person commits suicide. I've already deleted my Facebook, twitter and whatsapp. This is the only online profile I have right now and nobody knows about it. I'll delete all my Internet history too.
I do not want anybody harassed or blamed. I have left separate notes for my mum, dad, elder brother, best friend and boyfriend. I do not want any of them blamed.
I have written a separate note stating it was my decision and mine alone, nobody is to be blamed for it. But my last phone calls and messages were sent to my boyfriend and I am worried people will blame him. I do NOT want that. It would ruin his entire life. He's just 21. I'm not doing this over a boy. I've been planning this for years, even before I met him.
If they do check phone records to find somebody to blame, will my note make a difference?

Thanks.