In-store only, RadioShack retail locations offer the Apple iPhone 4S 16GB Prepaid Smartphone for Virgin Mobile in White (pictured), model no. MD866LL/A, or Black, model no. MD873LL/A, for $449.99. That’s $50 under our October mention and the lowest total price we could find by $200. Sales tax is added where applicable. Virgin Mobile’s prepaid plans will start at $35 per month, although registering for automatic payments will earn a discount of $5 per month. The basic plan will include unlimited texting and data and 300 voice minutes, while upgraded plans will feature more minutes.