Sorry this isn't in the right thread (MN Android bug that doesn't allow choosing the thread).
I just wanted to share one strange money-saving revelation. I have a pay as you go SIM and top up every month for a bundle of data and calls. I just received a text reminder and realise that I don't need it. I can use WhatsApp for calls or my landline's free call times and WiFi for all data on my mobile.
I wonder if phone companies have calculated their drop in income from PAYG customers.