In France I signed up for an exclusive offer with Free Mobile operator where 100GB/month (in France) for 1 year only cost 1 EUR per month, and then would go back to 19.99 EUR per month. After 11 months, the company shat itself they would lose a ton of customers, so decided to give a 10 EUR a month discount... indefinitely. The kicker is that their roaming deal in the US is amazing: 25GB per month at HSPA+ speed. So now I pretty much have a $11/month bill for my data plan in the US. I use Google Voice for people to contact me. Best deal ever.
Apart from the food, the thing I miss most from France. You can fibre hop indefinitly, because at any point in time someone's offering 100mbit or more at 10eur/mo. Currently 30 is the cheapest I can get fiber, at a measly 50mbit.
Just HSPA+ speed (I think). In any case they wouldn't just remove the service, they'd transfer to another protocol. For the life of me I can't understand why anyone would need more speed. It's not like I need to download a 3GB game in X seconds in a spot where I don't have a wifi. This whole LTE and 5G is marketing bullshit. No one needs that much speed. IMHO.