Apple appears to have sold out of its iPhone 5s stock, with shipping estimates for all models in the United States slipping from 7–10 days to an ambiguous "October" ship date. The phone, which went on sale yesterday, saw shipping times of 1–3 days for the first four hours that it was available before estimates dropped to a seven to 10 day ship time. Shipping estimates for online orders of the phone opened at 7–10 days in a number of coun