Assuming you are referring to BKK Suvarnabhumi airport … there are a dozen phone shops in the Arrivals hall (near the baggage carousels), selling a variety of SIM packages. I normally buy a 999 Baht 30 day data-only SIM, with unlimited (and fast) data. For less than $1 per day, I never have to logon to a dodgy WiFi the whole time I’m here, a real bargain. Happy trails.
I see. That’s good news. I realise you can’t use Uber in Thailand (however the app, if you did have it installed, can still be used for account management).
Before escalating to DefCon-1, try disputing the rides in your Uber app. (my experience is that Uber is always quick to cancel/refund for any disputes) Good luck.
Today is day 1 (assuming the Immigration authorities really have been directed to start giving Russians 90 days stamps), so there is not yet any pool of experience to draw upon.
Have you tried searching in Booking dot com? Aside from conventional hotels and homestays, they also have a lot of Air BnB style accommodation listings. Good luck.
If the new rule actually takes effect next week, Russia will join Argentina, Brazil, Chile, South Korea and Peru (these countries already have bilateral 90 days agreements with Thailand).
No. Further, whether you need a visa, a visa on arrival, or are visa exempt depends on your nationality. Take some time to review posts in this group and use the search field to search for some parameters that apply to yourself.