The iPhone’s sales are growing, but will it last?

When Apple releases its financial results this week, the reports will show iPhone sales growing again, bucking a year of decline. That’s the good news. The bad news – the average selling price of the handsets in the key holiday quarter, ending in late December, may show customers settling for older iPhone 6S models, rather than the iPhone 7, introduced in September, according to some analysts.

“Recent smartphone customers increasingly are opting for ...