If wishes were horses...

"The Peppermill wishing fountain," Karen swept her hand dramatically in the direction of a rather small fountain in the courtyard of the old castle.  She was reading from the little glossy guide book - £2 from the gift shop.  "Legend says that if you drop an offering into the fountain, the fountain will grant you a wish to do with that item.  One story from 1605 tells of a young kitchen boy who dropped a bridle in the fountain and made a wish, and went on to become a knight who owned the best horse in the land."
Lauren wrinkled her brow thoughtfully.
"I wonder... if I dropped a tyre in there, would I get a Ferrari?"
"You'd probably get thrown out of the castle," Karen chuckled.  "It seems most people toss a coin in - look."  She pointed at the coppery layer of glittering discs at the fountain's base.
Lauren fished in her pockets.
"I don't have a coin," she sighed with disappointment.  "But..." She fished her phone out of her pocket.  "I could use a new phone."
"Oh, come on," Karen snorted.  "You're not going to throw your phone in there."
Lauren gave her old brick of a phone a long, pondering glance, and then tossed it into the water.
Plop!
It quickly sank to the bottom and settled among the pennies.
"I can't believe you just did that!" Karen gasped.  "Quick, fish it out, it might still work!"
"Wait, we have to give the fountain time to work!" Lauren insisted, holding her friend back.
Suddenly the phone started to ring, vibrating across the floor of the pool, and sending little bubbles to the surface.
Lauren glanced at Karen in surprise, then dipped her hand into the icy water and snatched the phone out, trailing a stream of little droplets as it came.  She hit the answer button and gingerly put the damp phone near her ear.
"Hello?"
"Hello Lauren Prince?" a cheerful voice asked in staticy tones.
"...yes..."
"This is Linda from the Phone Company.  Congratulations!  We're ringing to tell you that you're our lucky raffle winner this month and you've just won a state-of-the-art smart phone.  We'll be posting it to you by courier, and it should arrive in the next couple of days."
"Oh wow, thanks!"
"Have a nice day, Miss Prince!"
"Thanks, I will - bye!"  Lauren hung up.  "I don't believe it!"
"Who was that?" Karen asked
"I just won a new phone."
Karen stared at her for a few moments.
"Let's get a tyre."
Lauren nodded and they both hurried away, back towards the carpark.