Hiya everyone

I didn't know where to put this question...I do have all ep's and sp's except Ikea.  My problem is with my phones in game.  When I purchase a cellphone and go to use it, it disappears and then I'm unable to use the home phones.  I was just wondering if anyone else has had this problem or if anyone knows what I can do to fix it?  Thanks in advance for any and all help