Re: A beelion users can't be wrong (can they?)
"OH MY GOD!!!! They know my phone number"
You need to look a bit further than the obvious to see the implications of this. The fact that you don't is exactly what the likes of Facebook rely on.
They don't just know your phone number. They know your phone, and by extension where your phone has been. They know who you know. They know where they've been. They know what you've shown an interest in, they know what your friends/colleges/relatives are interested in.
They are then going to sell that to any company who wants it. From that point onwards, each of these company you contact, for any reason, knows way more about you than you've actually chosen to divulge. They know just how good a customer you may or may not turn out to be. They have a pretty good idea of what you might pay for things, and just how likely you are to go to a competitor. When it comes to your relationship with that company, and any negotiations involved, the balance is skewed way over in their favour. Because they already know everything and you know nothing.
Don't really want you as a customer? Quote higher prices. Do want you? Lower. Reckon you're loaded? Higher. Know you're already likely to go elsewhere? Lower. Likely to influence a lot of friends' purchases? Lower. Billy no-mates? Higher.