what is the guarantee on these phones?

In lots of E-commerce, all of products has 1 year free warranty, and also support 30 days free change or money back. But don't worry about the phone quality, before he send out, he will test and pack it carefully. http://www.agoodic.com/ is also.
In the http://www.agoodic.com/ the sales person tell people returns, and guarantee.
Returns and RefundsAll our products come with a 12 month warranty.At http://www.agoodic.com/, your satisfaction is paramount - you will always enjoy a 30-day Money Back Guarantee. It works very simple. When you make a purchase with us, regardless of value, you can return the product(s) within 30 days from the date we first shipped your order for refund or replacement.Whether the product is defective, seems defective, or that you change your mind and simply do not like it, you are welcome to send it back to us and we will issue you a FULL REFUND once we have received the product in question. Alternatively, you can choose a replacement of the same product or product of the same value. If you find item was lost or damaged, please don't sign in and appeal to your local Express corporation as soon as possible, then inform us by E-mail within 3 days, We will contact our local Express corporation and try our best to resolve this problem.We are not responsible for service failures and losses caused by force majeure.However, the original and return shipping and handling charges will not be refunded or reimbursed under all circumstances. And we are not responsible for returned products lost in post.In case of returning goods, please kindly contact our customer service@agoodic.com, We are not accepting any returns without any information. Shipping charges are not refundable.Warranty will be voided if returned products are abused, mishandled, modified, misused, physically or inflicted damaged by users. We reserve the right to charge a repair fee of 40% of the invoice amount if the warranty expired or is voided.