假设你是卜曼宜，你购买了一部某外国公司生产的手机，因有质量问题，要求该公司更换。请根据作文-地带提供作文地带提供下列要点，用英文写一封电子邮件。

　　要点：

　　1. 问题：手机不响铃，不能发短信；

　　 该产品已售完，无法更换；

　　 型号新，无配件，无法维修。

　　2. 要求：公司应尽快予以更换。

　　注意：

　　1. 词数为100左右；

　　2. 参考词汇：配件:: spare part;

　　3. 电子邮件的开头和结尾已为你写好（不计入你所写词数）；

　　4.已给出的电子邮件的开头和结尾不得抄入答题卡。

　　Dear Sir,

　　 I am writing to you for the mobile phone of Dephone-S250 I bought on 20th Apr. 2008 at Tele Mall in Wuhan, P.R. China….

　　 Thank you for your consideration.

　　 Sincerely yours,

　　 Bu Manyi

　　Possible version:

　　Dear Sir，

　　 I am writing to you for the mobile phone of Dephone-S250 I bought on 20th Apr.2008 at Tele Mall in Wuhan, P.R. China. Ten days after that, it didn't ring and send short messages. Then I took it to the seller, but was told that the model had been sold out and I had to wait at least three months for a new one. Later I went to the repairman. He said since it was a new model in China, it was impossible to fix it without the right spare parts. I was so desperate on hearing that. How can I wait that long? Therefore, I require that you send me a new one of the same model within a month.

　　 Thank you for your consideration.

　　 Sincerely yours,

　　 Bu Manyi