Joke Collection Website - Cold jokes - What's the difference between UlM card and OTA card? Which card is better?

What's the difference between UlM card and OTA card? Which card is better?

They are all mobile phone cards, which makes little difference to ordinary users. OTA cards are smaller ... but they are not easy to install.

In addition, OTA theoretically supports more services and can store more things (but only a few hundred K), but the basic OTA card business is just a joke for smart phones.