Unless you catch WiFi on punt day, you'll be overpaying for data. All swings and roundabouts. Not all SPs use WApp so also limiting.
I've been wondering about that. How much do they actually charge for data usage?
1mb data is 10p with my Asda sim.
A single message on whatsapp is like 33kb or something, 1mb = 1000kb, so it's insignificant.
But do they charge me 1mb fully despite the fact I've only used a small fraction of it, or do they charge me 1mb per day...it's confusing.
I contemplated using my real phone as a hotspot - for my punting phone - when I'm out so I can use whatsapp free of cost.
Also my plan is to use whatsapp at home to set up the punt: ask for availability, address, booking, etc. And yes, I think about half of WGs are on whatsapp, so it won't work all the time.
Yesterday for instance I used whatsapp to text a WG if she's moving to a specific area (nearby) any time soon since she's one of those Brazilians that hop around week after week to different places and I know for a fact she's been in my area before.
She said 'no' but that's a case I would never have used up my credit for, but on whatsapp on my home wifi, it was free.
Then text once I'm at the location to just get the door number basically.
It's a bit of a puzzle, but if other people are also after a solution for their punting phone, there's a few ideas here.