Вот библиотека FTP, которая работает на iPhone:
http://code.google.com/p/s7ftprequest/
Пример на их веб-странице выглядит просто:
S7FTPRequest *ftpRequest = [[S7FTPRequest alloc] initWithURL:
[NSURL URLWithString:@"ftp://192.168.1.101/"]
toUploadFile:[[NSBundle mainBundle] pathForResource:@"Info" ofType:@"plist"]];
ftpRequest.username = @"testuser";
ftpRequest.password = @"testuser";
ftpRequest.delegate = self;
ftpRequest.didFinishSelector = @selector(uploadFinished:);
ftpRequest.didFailSelector = @selector(uploadFailed:);
ftpRequest.willStartSelector = @selector(uploadWillStart:);
ftpRequest.didChangeStatusSelector = @selector(requestStatusChanged:);
ftpRequest.bytesWrittenSelector = @selector(uploadBytesWritten:);
[ftpRequest startRequest];