After years of decline, smartphone average selling prices (ASPs) are bouncing back, as certain groups of consumers seem prepared to shell out for an aspirational model like the iPhone X. One thing that Qualcomm and Apple, amid their legal wars, agreed on in their respective results announcements was that ASPs were on the rise, and this is causing challenges for some operators. On its own earnings call, BT said that the increase in handset acquisition costs had hit earnings at its mobile unit, EE, in the last quarter of 2017, though revenue and postpaid customer numbers were up. Marc Allera, CEO of BT Consumer, also pointed to the launch of three different Apple devices, instead of the usual one, as…