My incoming calls go straight to voicemail and phone doesn't ring at all. How do I change this? Thanks

Verify that "Do not disturb" is off otherwise all your incoming calls will be forwarded to your voicemail.

Your iPad is ringing because iCloud has connected both. To disable this on your iPad settings go to iCloud and disable that.

power down, take battery out for a complete 2 minutes. While battery is out hold the power button. this decharges built up static electricty. After 2 minutes reinstall battery and power on phone. If it doesn't work call your provider they will walk you through a series of steps to hardset your phone.

Remove the battery and allow the set to phone to reset. Now check for the ringer setting at teh back of the base phone to be set to the maximum rings, there can be three settings.
Some times this is also set on the menu.
Connect and test the timing to confirm

check your incoming calls settings and see that you did not choose it to divert to voice mail number

Please check if any call divert or incoming call barring (found at settings menu) are actives .

Per the Sprint support site at http://search.sprint.com/inquiraapp/ui.jsp?ui_mode=answer&prior_transaction_id=2&iq_action=5&answer_id=33554455&highlight_info=6293864,0,6&turl=http%3A%2F%2Fsupport.sprint.com%2Fsupport%2Farticle%2FSet_the_number_of_rings_for_voicemail%2Fcase-ev207663-20090626-084943#__highlight&id16=voice+mail :
"A call will roll to your voicemail if unanswered after 23 seconds.
This setting can't be changed. However, on your Sprint phone, you can change your ring tone to one that reduces or increases the number of rings you hear before an incoming call rolls to voicemail.
For details about setting up and changing your ring tones, refer to the user guide for your phone."
If this is not the problem with your phone I suggest you call their support line:

Call *2 from your cellular phone or 888-211-4727 (Sprint phones) or 800-639-6111 (Nextel phones)
They may ask you to perform troubleshooting tasks, so it would be best to call from a phone other than the one you need help with.

This can be handled by the DND feature in your admin settings... Do not disturb will transfer your calls direct to voicemail without ringing the handset.

Go to call settings and cancel all the call settings information..
note: you will see call barring , call forwarding, call waiting options
just cancel all of them if it will not work, in the phone settings look for the answer call and change the settings there

i would got into your voicemail settings and check to see if you have it set to ring once then straight to vmail.. i'm not sure how your phone is set up completely but i would assume you can adjust the amount of rings before vmail picks up.. is this phone new to you?
hope this helps..
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get your mailbox number then type in **61*44then mailbox mumber*11*then a two digit number between 00 and 30 (seconds delay).