我用了一位网友的code省了10元，我也把我的code 007731写出来 (有效期至9月6号），双方都受益。具体手机发email方法如下：
send the message to this number: 0000000000 (that is 10 0's)
Write the text message in the following format:
address@domain.com Here is the message
(in other words, first the email address, and then a space, and then the message)
我已经测试过，非常简单快捷。

You call Customer Service# 1-866-310-1023, and tell the representative that you want to redeem the $10 airtime. she/he will ask you the referral code. After inputting the referral code into system, the representative will tell you current balance of your account.

Enjoy it