52 random acts of kindness that each take under 52 seconds. One action each week, over a year takes less than an hour of your life.
Whether we all have mobiles or not, whether we remember when there were no mobiles or we don't, we never know when we might be in need of a public phone. Why not leave some change in it for the next person - whether they are someone who doesn't have a mobile phone, or the battery has died, or they have run out of credit or coverage, you can make it a little easier for them to make that contact.
And even if it isn't someone making a call it could end up in the hands of that person who is desperate enough to go round each phone, pressing the change button and hoping for a few pence to make up the cost of a hot drink.
Whatever the money goes towards could brighten their day or be just that lifeline to talk someone back from the edge.