You can replace your string so that it will allow you to send special character. You can use string method stringByReplacingOccurrencesOfString
NSString *RaisedBy="Your Special character string";
RaisedBy = [RaisedBy stringByReplacingOccurrencesOfString:@"&" withString:@"&"];
RaisedBy = [RaisedBy stringByReplacingOccurrencesOfString:@"<" withString:@"<"];
RaisedBy = [RaisedBy stringByReplacingOccurrencesOfString:@">" withString:@">"];
RaisedBy = [RaisedBy stringByReplacingOccurrencesOfString:@"'" withString:@"'"];
RaisedBy = [RaisedBy stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]];
This code will also support thai language.