No dial tone

Contact is bad and/or the electronics are no longer any good.

Well, cannot find ia5862...but from ia5863 which must be similar; Manual at http://www.scribd.com/doc/64707312/Vtech-Phone-Ia5863-Manual-r2, it says... Set the dial mode
If you have touch tone service, the phone is ready to use as soon as the battery is charged. If you have pulse (rotary) service, you'll need to change the dial modee• Press
PROG.
• Press o runtil the screen displays
DIAL MODE:
and the current settings• Press
SELECT.
The current setting blinks • Press or to select
TONE
or
PULSE.
• Press
SELECT
to save

Hope it helps, sounds like the phone should ALREADY be on tone dial out of the box.

Are you sure that the phone is even trying to dial? Push 1 digit and make sure dial tone is going away. Could be bad dial pad.

Enter the model of your VTech phone into the search box at http://www.vtechphones.com/support/general/manuals to download a copy of the manual. The manual will explain how to switch your phone between pulse and tone dialing.

Vtech phones are junk! I have had many trouble calls for no dial tone,only to find out the Vtech phone is the only one they have,and it is defective.(It really DOES pain me to bill someone 91 dollars to tell them their 21 dollar phone is broken-always try another(preferably hard-wired) phone before calling the phone company!

Since you declined to specify the model of your VTech 5.8GHz phone, I can only suggest that you enter it into the search box here to download a copy of the manual. The manual will describe how to switch between pulse and tone dialing.

Usually there are two modes provided to all fixed line telephones. Tone mode and pulse mode. Pulse mode will dial the call slowly and Tone mode will dial calls quickly. Your phone is in Tone mode i guess. You need not dial the numbers again. Wait for few seconds and the call will get accomplished!

I would contact your phone provider. It could be a coinceidence that the dial tone stopped working.
DSL does not require dial tone to work.

Unplug the phone entirely for about 5 minutes and then plug it back in and see if this works.Good Luck!

Here are the instructions for one vtech phone (may not be quite the same as yours but may work or give enough hints for you to figure it out):
Press PROG.•
Press ? or ? until the screen displays DIAL MODE: and the current setting.
Press SELECT. The current setting blinks.
Press ? or ? to select TONE or PULSE.
Press SELECT to save.