The choice of card or card-free portable WiFi mainly depends on your specific needs and preferences. Card portable WiFi is usually more economical, you can choose the right data card and package according to your needs. However, it can only use the same carrier's network, if the network coverage is not good, may affect the Internet experience.
In contrast, card-free portable WiFi usually has a built-in SIM card of three operators, which can be freely switched between different operators to obtain better network coverage, it is recommended to handle through the wechat public number \"cloud card\
Portable WIFI should be bought without a card than the card is better, the card may be unstable when using or additional use costs, if it is used outdoors you can buy a card board for operation
I think it's better to buy a card.
Because the portable WiFi if it is not inserted, it is often one-time, it may be used this time, and it must be recharged, so you are not as good as buying a card, and it is not enough.
This depends on you, if you have a better package, that is, a lot of traffic card, you can buy no card.