Foxconn is admitting that it cannot keep up with iPhone 5 demand due to production difficulties.

On Wednesday Foxconn chairman Terry Guo told AFP that Foxconn shipments are “insufficient” given the huge market demand.

He went on to say that the iPhone 5 design has rendered production difficult, but he did not go into details. We are guessing that the issue is at least in part caused by the scratch prone aluminium body and efforts to step up quality control.

Apple sold five million iPhone 5s over the first weekend of sales back in September and it is still going strong, in spite of supply issues.

More here.