Uploading data to an FTP server

I have a project on uploading a series of data to an FTP server which will be fetched by a mobile app. The mobile app part wherein it reads the text file (saved in the server via FileZilla) in the FTP server is done but I am having a problem with uploading (or even downloading) files. I'm not sure if the information for my FTP server is correct or not because the GSM/GPRS shield's response is OK but when it comes to the AT+FTPGET=1 command, it does not pursue.

Another thing is I'm using ServersFree (www.serversfree.com) as my hosting site. Can anyone recommend a better hosting site?

Thank you to anyone who'll be taking time to help me.