Data only Sim card

[Papa Goose]

Hi there,

We are in Thailand over xmas and new year, BKK for 4 nights and HH for 14, back to BKK for 1 night then Singapore and home. I have an unlocked MiFi unit and did have a DTAC data only sim card which it is now dead. I use the Mifi for out and about internet and I turn cellular off and our mobiles run on the Wifi which is peachy as no roaming charges. I did find 7 & 15 day sims, but In euroland you can buy a data only sim loaded with an amount of data say 3 gb valid for a month, and can top up if needed, is there a provider in LoS that does something similar?

Thanks for any help.