@Lucie *****
you can buy things in 7-11, Tesco, big c, anywhere that accepts TurMoney payment. Online shopping too. Also transfer to friends on true money. Dude said it's useless but it's actually very useful. Plus, most Thai people have truemoney, so even if you didn't upgrade, you can scan plenty of mom and pop places cuz many are happy to accept a private transfer on their phones.
But yeah, upgrading to full account is easy too, and then you can scan PromptPay (the QR payment everyone else is using).
I have a Thai bank but still use true money often cuz 7-11 doesn't do PromptPay, only truemoney wallet.