so i just switched my mytouch 4g over to straight talk i bought the sim online and activated it through thier customer care and the phone works and the data and everything works and so does the 4g. but everytime i call voicemail it says do you have a voicemail press star then asks for my number and after i type it in it says sorry this is not an active voicemail number or something to that effect. so when someone tries to call me and i ignore it they just get a busy signal on their end no voicemail or anything. any one have any ideas on how to get this to work.