Sprint on Thursday announced a new $60 unlimited plan in its latest bid to reverse a decline in its subscriber numbers. To get the $60 rate, customers need to pay full retail price or bring their own Sprint-compatible devices. The plan is available starting Friday for both new and existing customers, Sprint said. “People know Sprint for unlimited,” CEO Marcelo Claure said in a statement. “We have long been the leader in offering customers unlimited data and that leadership continues today with our new $60 unlimited plan.” Claure added that the company has heard feedback and, unlike the family plan deal announced earlier in the week, this offer is available for both new and existing customers. To qualify for the new rate plan, Sprint said, an existing customer must have a line that is no longer under contract, have purchased a phone using Easy Pay installment billing or add a new line of service.