Vodafone UK ran out of supplies of their latest Sure Signal femtocell last week – their latest 3rd generation model is sometimes called a femtoplug because it resembles a mains electrical plug. Their online shop posted a "currently unavailable" status on the product, and shops with stock found they were being quickly snapped up or redirected elsewhere.
This led to rumours on the Vodafone forum that the service itself might be discontinued, with one customer being told by customer services that "we've had a top level instruction saying NO more Sure Signal devices are to be supplied". In practice, this was simply a case that there weren't any available in stock at that time.
This week, the online store is back to normal and accepting orders – presumably fresh supplies have been delivered and stocks replenished.