I've tried dialing with/without area code, with a saved contact, and without the contact saved. I've had no trouble dialing out to other numbers and I haven't installed anything since the problem arose. I really don't wanna hard reset! I already contacted Sprint CS and they asked for the number and some time to resolve the problem. Their system didn't show anything problems and I was told I will receive a call within the next 24 hours from tech. support.

You also might want to check with your home phone service and see if it's something on their end. Other than that, this has me stumped!

It was working just fine til Saturday night. A couple hours before this started happening, I had called my house phone to see if my brother was still home. I usually call home many times a day because I'm back and forth amongst home and other places from 7a-9p. Once again, thanks for your help Musicman247 and others who posted here! Hopefully tech. support can iron this out for me!

You might try using backup software such as Sprite Backup (you can download a free trial) to back the entire phone up to a self-executing file on an SD card, then hard reset. Try dialing the number immediately after the hard reset. Then restore the backup from the SD card; if it worked after the hard reset, but not after the restore, then one of your programs or settings is interfering with the phone. If it worked after the hard reset and also after the restore, problem fixed. If it did not work immediately after the hard reset, and Sprint can't fix it, then get the phone exchanged at Sprint and restore your backup file to the new phone using the Sprite Restore Device Upgrade option.