United StatesのベストeSIM 2026年版

In the United States, there are four major mobile network providers:

✓ AT&T: Founded in 1983, AT&T is one of United States’s biggest mobile network providers with a customer base of over 150 million. It is widely known for its excellent coverage and speeds, with 4G download speeds of up to 25 Mbps. According to Opensignal, AT&T ranks among the highest for 4G availability and latency nationally.

✓ Verizon: Founded in 2000, Verizon is the largest mobile network operator in the United States with a customer base of over 150 million. It is well-known for its excellent coverage, but its 4G download speeds can be quite slow, ranging from 6-20 Mbps. Opensignal ranks Verizon as the highest in the US for 4G download speed nationally.

✓ T-Mobile: Founded in 1994, T-Mobile is the third-largest mobile network provider in the US with a customer base of around 80 million. It is well-known for its fast 4G download speeds, ranging from 16-20 Mbps. Opensignal ranks T-Mobile as the highest in the US for 4G availability nationally.

✓ MVNOs: There are also several Mobile Virtual Network Operators (MVNOs) operating in the US, such as Boost Mobile, Cricket Wireless, Metro by T-Mobile, and Visible. These providers generally offer lower prices for their services than the larger network operators, but usually have more limited coverage.