Update: The owner is in fact named Marilyn Mansfield - most/all other info she provided to people was false. She was/has been using fake images stolen from girls off instagram. On multple occasions she claimed an old friend with Schizophrenia/Dissociative Identity Disorder was at fault copying her however these claims were sent from an email address that was later linked to a Skype account automatically by Outlook. This Skype account was later used by her still linking pictures that weren't hers & going along with her original story to another. She gave up on this excuse and resorted to deleting her accounts/blocking messages when further questioned.

Someone has set up a tumblr exposing this, search up marilynmansfield-fake.

Hey AnonFromUSA, thanks for the update can you drop a way for me to contact you about what this person is doing? it can be a throwaway account if you wish.

The person resorts to claiming someone else is acting like her when caught out but we've pretty much proven it's just her, I've attempted to reach out to the persons family to let them know the person needs help and they're reluctant to even discuss the matter.

We were tipped off on an account where she was posting real pictures of herself on tumblr. Google has reblog copies if you search correctly, it seems to be a "real" non catfish blog she had.

We know the persons real identity/appearance & address but will not publicly post this information as I'm sure it would be considered doxing and wish for this to remain here to warn others off.

Can confirm that she is still using said steam account and alias. Keep your eyes open, friends.

Edit:
Current set url is actually: http://steamcommunity.com/id/011101010111001001101100/

Post got messed up, don't know how.

Update! avoid this person at all costs for your own sake! do not give money & gifts to and do not get fooled into believing any of the lies or stories you'll be told.

Have been given further supposed information on identity/contact. but still appreciate any tips people may wish to provide.

Cannot guarantee number is still being used by this person!

Urge all/any to not listen to excuses or fake stories used to explain this warning being here; in the event this person is still using these aliases.

Person is highly manipulative and without a single doubt, fake.

Further details:
STEAMID: STEAM_0:1:26271937
http://steamcommunity.com/profiles/76561198012809603 (Permanent URL/Hidden)
http://steamcommunity.com/id/011101010111001001101100/ (Current URL)
https://www.youtube.com/channel/UChmte717RjtsbqP2cOzQKMA
https://twitter.com/Bittersweet
http://thatgirlwiththebigmouth.tumblr.com/
Steam Name: 「jinx」

This is not a post 'out to blast someone' or just some crud false information, this person is not real; is lieing to you and has done this to multiple people in the past (there's a list of people, infact) make no mistake, if you're talking to this person - there's nothing real to her! she will use any excuse/story to make this out to be false - don't be a fool!

I've had experiences with the said number.
Can confirm previous comment it true

!!!! BEWARE !!!!
The owner of this mobile is a catfish(fake) online and has used this mobile number actively under the following alias's during 2010-2013 (may be earlier & later) and most likely still is, also lives in Melbourne, Victoria (possibly in St Albans area).

Name Alias:
Marilyn Mansfield
Melissa Magdalene
Kat Davis/Katherine Davies/Katherine Mansfield

Gamer Alias:
Pyropants
Vixen/Vyxsyn/Vyxsin
Toxica/Toxika
Jinx
Teqnostar
Hexagram

Has an account/profile on "Steam" under the name of Jinx (currently) acting as someone entirely different, also has a long history of "Catfishing" and has fooled multiple people into giving presents/gifts online, mainly used alias was "Marilyn Lily Mansfield".

(This mobile number has been confirmed and double checked, if you know the real name of this catfish please comment with details)