I just switched over to the $30/month 4g plan (100 minutes/unlimited text/unlimited data (4g up to 5gb). Since the change my phone is defaulting to t-mobile voicemail even though I have google voice selected. (Even tried setting it to tmobile voicemail and then back to google voice). But I seem stuck on t-mobile voicemail instead of my google voice. Is this a problem for anyone else? Thanks!