Motorola Photon 4G :: Number Of Rings Before Phone Actually Rings?

Been a happy Sprint user since 2005 and have used various dumb phones and smartphones. The Photon is my 3rd Android.I have noticed that each phone , whether smartphone or not, has the same issue that has caused me to miss incoming phone calls here and there - the caller dials my number and hears several rings before my phone actually starts ringing. The phone goes to voicemail before I have the opportunity to answer the phone.The solution for my phones has always been to adjust the Slot Cycle index from the default setting of 2 to the setting of 0. This causes the phone to poll towers more frequently, thus the phone is more quickly aware of a new incoming call. The only negative implication is that the phone goes through battery a bit more quickly during the day...but it's really only a tiny difference. I've done this on my phones, on my spouse's phones, my mom's phone, etc.

Since the Photon's battery life is so much better than my prior phone (EVO 4G) I am very comfortable in adjusting the Slot Cycle index, so I obtained my MSL from Sprint and attempted the adjustment by going to the Dialer:##DATA# ->tap green Dial icon -> to the Data Settings menu...tap Advanced->From there you can see that the Slotted Index is set to 2. So I wanted to change the setting but can't get to it from Menu->Edit->enter MSL code->VerifyI called Sprint about this issue, and in the past they have helped me to change the setting. I have called more than once and have been dealing with the more advanced Tech Support team. No one at Sprint can figure out how to adjust this setting on the Photon.