this happenned to me. your first line of defense is to call your wireless carrier (mine is verizon) and they will cancel the charges---dial 611 from your cell phone--or the cell that the texts are coming in on. we never ordered the service, and do not know how or why they got our number. your son is not lying and this has happened to alot of people i know. when you text 'stop', the message will fail. don't go to the website or call enmob, that will perpetuate the trouble. do complain to the fcc and the better business bureau, and anyone else you can think of. we got 10 messages before we realized we were getting them (my husband doesn't even know from test messages or how to view or send them). we called verizon and they deleted the charges and stopped test messages from that phone, whick is ok because we don't use that feature, but if you like to use your test messaging, then this can be a problem. you may be able to block the texts from that number (enmob) from your phone. also, send a 'spam complaint' to the administrator of company who provides the website for enmob, you can get this email address and more info by looking at a site called dns stuff (google the name and you will find it). you can find out if any siteor email are legit or not using this site. it is (dnsstuff.com)scroll all the way down the page and see the features it has.
i don't know how enmob can get away with this, but verizon, cingular, and all the other companies are powerfull enough to stop it provided they are not the ones that instituted it in the first place. i was steaming mad when if found out that verizon even allows this. it is a scam!
good luck and kudos to you for your research and action!
oops, the dnsstuff website is only really usale for spam emails on a pc--though it is a good site to use to find out if an email is legit---if you look at the full headers in your emails, you get the ip number of the sender and enter in on dnsstuff to find out if the email is spam, who what and where 'info' about a particular email sender---it won't help in this instance (enmob) but is usefull in other situations with regular pc emails.
btw--we went to the enmob site, called the number and got the same crap you did. if you go to the site, be carefull--it looks all professional, but don't allow cookies and really, just don't even go back, it is all a rip off designed to get your money. i am amazed at how many people from all over the world can think up new ways to use your own possesions to rip you off!
funny how the name 'enmob' reminds one of 'enron'....
anyways, i went to the enmob site and looked well at the small print and at the bottom of the page is a place where you can send them a complaint or a message, whatever---i go to the page and the first thing they want is your phone number (hah) of course i did not enter a legit phone number--then they want your email address--oh no, you'r not gettin' that! without entering any of my personal info, i sent them a message along these lines"
...."shame on you for your bad business practices---you have a nice service that with proper advertising you can make money, but no, instead you sent unsolicited messages to innocent kids and disabled people---so when they have to cut off their own text messaging feature to keep you off their phones, they won't be able to use the texting for any reason. deaf people, students at university (remember virginia tech? they need alerts to protect from potential tragedy), and kids who need to reach/hear from their parents are gravely inconvenienced because of your dirty practices. not to mention taking money from people who are on tight budgets and need every penny just to keep a roof over thier head and food on the table for their kids AND the huge waste of time on phone calls and internet searches to find out why and how to stop this crap! clean it up! i know of at least 10 people who are hunting for your head through the proper sources (fcc, bbb, etc) to put you out of business! CLEAN IT UP!"
i felt better after typing that, whether it reaches them or not and whether or not they read it is another thing.
i know i said to stay away from the site, but i am a pc geek who knows how to detect and keep the bad stuff out of my pc from the internet...i don't doubt they have something underhanded in place---but they can't hurt me anymore. i suspect that it you sign up for something legit that requires your cel phone number on the internet, it somehow makes it's way to enmob or another like site and that it how this happens. i think that even if you never visited the enmob sit or never gave them your cel number, they have figured out a way to get that info and send these unsolited services and charges. i did more research and there are alot of people on the internet complaining about this same site and problem. as you can see i am obsessed with getting some closure and satisfaction. i am like a pit bull when it comes to a breach of my privacy and charges for something i never signed up for.
ok, i feel better now, i hope you do to.
let us know how it turns out!
I emailed him a reply asking him to do his job and skip the canned response and actually look at my son's account. It has only the one Premium SMS message which charged him $9.99. If my son had responded with a PIN number there would have been a reply text to that one. I have completed an online complaint with the BBB where the Verizon Wireless Prepay complaint address is located and am going to file an online complaint with the State Attorney General next. I also used Google Local to find the address booger73 came up with for Enmob and it's located on the island Nevis which is south of Puerto Rico. Thus the foreign accented person I got when I called the number listed. I don't see how Verizon can not stop the scam artist when they would have to have some way to forward my money on to them. 
