When you call your NEXTEL phone with a landline, do the rings that you
hear on the landline sound strong and then fade?  It is happening with
me, and someone said that it doesn't sound very good.  I did verify
that this was happening.

Also, I've heard people comment that sometimes when my phone rings, as
it picks up to go to voicemail, dead air is heard, and the voicemail
doesn't come on.

Do these things happen to other NEXTEL users, or should I contact
customer service?