(Telecompaper) Sprint has officially launched its USD 60 Unlimited Plan, providing consumers unlimited talk, text and data. The new plan will be available to both new and existing Sprint customers beginning 22 August. To qualify for the plan, customers much purchase their device through Sprint Easy Pay, pay full retail price or bring their own compatible device. The new offer from Sprint presents a direct challenge to T-Mobile, which offers the same plan with LTE access at USD 80. T-Mobile responded to Sprint's announced with a new customer referral programme, offering a free unlimited LTE data upgrade for a year to Simple Choice customers who refer a new customer from Sprint, Verizon or AT&T.