But it sounds like prepaid doesn't include LTE?
LTE is avaible just for Contracts. But HSDPA is so fast in 99% you dont neet LTE.
So A1 is suppose to have the best network.
thats not true. All 3 Operator 3, TMA and A1 have quid the same Network and in many case the Share the Tower. Just locals see the different between the Network.
This page shows plans that include LTE but I don't think these are prepaid:
No Contract.
Are there any sim cards I can purchase in Austria that will allow data access in the Czech republic as well?
If you have Money on the Card Roaming is possible but very expensive. Depending of the Operator in this Case its 3: 0,24 €/ MB so a local Simcard will be cheaper over the time.
If someone want a Activated Simcard i can send it!
And recharch is very easy! All Supermarket Company sell a Recharch Card and allow it to pay with a CC for expample: Billa, Spar (+Interspar, +Eurospar), Merkur, Zielpunkt
Discounter dont accept cc like: Hofer, Penny (?)
EDIT: What is very Important for all Traveler who Travel Beween Salzburg and Innsbruck (via Kufstein) the Train dive truth Germany it means Roaming!