May I ask what are the pro and cons between sim card (data only) and pocket wifi... We will be going to Hokkaido for 15days. Always rented a pocket wifi with our previous trips and had no trouble. But the price had gone up from our previous rental deal, so just wondering if getting the Sim card from Japan rail link is worth it.. We will be renting 2 pocket wifi units or 2 sim cards. The pocket wifi gives 50GB total usage per unit, which is plenty. Does the sim card option provide unlimited data??