Apple’s iPhone 5S will ramp up production later this month, according to a report from AllThingsD. “Sources familiar with the company’s plans” have confirmed reports about increased iPhone 5S production, including a mention from analyst Peter Misek. Notably, Misek previously claimed the 5S would enter preliminary production in March for a June or July launch. Misek has now said the latest increase in production will follow current production of Apple’s unnamed budget iPhone, which AllThingsD suggests will be “mid-end,” and likely to sell for $300 to $400 unsubsidized. The AllThingsD confirmation of iPhone 5S production can be taken as highly likely to be accurate, and its discussion of the budget iPhone appears to add further weight to prior pricing rumors on that topic.