straight talk?

i need opinions and experiences plz!! iv had straight talk for about 3 years. everything seemed to be great until lately. does anyone here have straight talk? do u like it? does it work? Lately iv had problems receiving and sending texts/calls. i literally dont receive about 30 percent of my messages and i dont know if its the phone or the service..anyone else have this problem with straight talk service or is it the phone?

*i know i dont receive messages because iv used other ppls phone to txt mine to see if it works and sometimes i never get the message...any ideas?