"@" doesn't translate when Twitter sends to SMS

[kyct]

What's happening is I have my main Twitter account and an extra
account. I follow the extra twitter account from my main account so I
can recieve SMS updates for whatever I want. The only problem is, if a
status update on my extra account contains the symbol @, the message
cuts off when it gets sent to SMS.

For example, I have the following status update added to my extra
account:

"Party @ 500pm; Bring beer"

This message gets posted to the extra account but, when twitter sends
it through SMS, it comes out like this

"Party "

I have confirmed that my phone can both send and recieve the @ symbol
from a number of sources but it can't recieve it from Twitter. Has
anyone else run into this issue?

Of course, this is the all important line I'm using to post the
message, nothing special:

curl_setopt($curl['twitter'], CURLOPT_URL,
TWITTER_API_URL.urlencode(stripslashes(urldecode($message))));