When a cell phone rings then a busy signal, you might be making a call from an area with a coverage gap. As always, sprint customer services never ceases to disappoint (21 years as a customer because there aren't better options) this is the conversation after 2 hours already spent bouncing around on phone tag with technical, customer service, and telesales. Looking For The Best Cell Phone Signal Where You Are Theres An App For That Cbs Philly I've also heard of some call blocking apps that can perform this feature. Busy signal on cell phone sprint . Any incoming calls all tell me they get a normal busy signal. Tap settings > phone > call forwarding. Repeat dialing saves you from having to repeatedly redial a busy number. It's landlines and cell phone, verizon and sprint and at&t, found that out by going to an at&t store and they used their verizon landline, which i found ironic. Can receive calls on the cellular network; See if call forwarding i...