The mobile network said half of the handsets had been pre-ordered before the smartphone's launch on January 15.
"Just over a week since launch and @VodafoneUK has already sold its 100,000th iPhone! #100k," Vodafone announced on the official Twitter feed on last week.
The network announced in December that the iPhone would be available this month.
The number of handsets sold by Vodafone compares well with O2, Orange and Tesco Mobile.
Orange reportedly took the month of December to shift a similar amount of Apple smartphones, which Vodafone managed in a week or so.
"The demand from both consumer and business customers has been phenomenal. They want an outstanding phone on an outstanding network and we're delivering that." a somewhat happy Guy Laurence, Vodafone CEO, said.
Prices for the Apple iPhone on Vodafone start from £30 per month, rising to £75 per month depending on the plan. Full pricing details can be found here.
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See also: Vodafone next with UK Apple iPhone deal