I was curious about which budget SIM 20GB plan is the best, so I compared various options.

If you're prioritizing a balance of speed and affordability, povo is a good candidate. Since it uses au's network, communication quality is stable, and the actual cost when using 20GB per month can be kept in the low 2,000 yen range. However, the downside is the hassle of purchasing data separately each time. If you want to pay the same amount every month, online-only plans from docomo or SoftBank, like ahamo or LINEMO, might be more convenient.

mineo's feature is that you can choose from three different carriers. It's suitable for people who want to keep using their current device. However, the initial cost is relatively high, and since it's an MVNO network, speeds can drop depending on the time of day.

When comparing budget SIM 20GB plans, what's important is not just the simple price but also matching the plan to "your usage." If you use LINE a lot, LINEMO is a good choice; if you watch a lot of games or videos, services with count-free options are worth considering; and if cost is your top priority, options like Japan Communications SIM are worth looking into. For those unsure about budget SIM 20GB plans, it's best to first organize what you use most often before making a choice.