I tried using the SIM-unlocked Galaxy S8+ overseas

I came to New York to cover the presentation of the "Galaxy Note8". He was at a loss as to what mobile line to use for communication, but this time he chose an AT&T prepaid SIM. The United States is eligible for DoCoMo's overseas 1-day package campaign, so if you are staying for a short time, you can get by with this, but I decided to buy a SIM card.

The terminal is a “Galaxy S8+” that has been SIM-unlocked by DoCoMo. As I mentioned earlier in this corner, the terminal currently in use was replaced by the mobile phone compensation service, but the status of unlocking the SIM before it broke was firmly inherited. In other words, I received a replacement with the SIM unlocked. The details of the operation around here are truly mobile phone compensation. Similarly, when purchasing in bulk, I would like you to make it SIM-free from the beginning.

The Galaxy S8+ also covers some international frequencies for international roaming. If you unlock the SIM and insert a local SIM, you can use them

The LTE frequency is a little special in the United States, but if you look at the bands supported by the Galaxy S8+, you can see that it covers a fairly wide range. . Band 4 and Band 17 match AT&T frequencies. Band 2 and Band 30 were not covered, but during my stay, I was able to use it comfortably without dropping to 3G.

Especially in the city or at the presentation venue, T-Mobile's network was congested and the speed was not very good. Separately, I wrote the T-Mobile SIM card information to the iPad with Apple SIM, but I felt that the main terminal was AT&T and it was the correct answer.

However, unfortunately, with the docomo version of Galaxy S8+, carrier aggregation is not available. This is because carrier aggregation is optimized for Docomo frequencies. So in many cases, LTE was 10MHz wide, and the speeds were ``fair''.

Carrier aggregation was not possible, and the speed that was often connected with a width of about 10 MHz was reasonable. It won't be as explosive as in Japan

When I visited the United States at CES in January, I had an AT&T SIM card inserted in Huawei's "Mate 9", but at this time carrier aggregation was not possible. was Some frequencies are not enough, so if you have a Mate 9, I don't think you had to force yourself to use the Galaxy S8+.

However, it is still convenient to be able to use the Galaxy S8+, which I usually use as my main terminal, on the AT&T line. If you don't have a SIM free smartphone that matches the US frequency, it will be a strong local option.

Balance on the morning of the third day after signing the contract. If you run out of data, you can easily add more from this page

By the way, AT&T did a $2 a day, $1 per 100MB billing plan. The basic fee of $2 is not charged unless a call or SMS is used. I charged 15 dollars here and paid 5 dollars for the SIM card, but it seems that it will be almost used up in 3 days. It cost $20 for 3 days. It is calculated to be about 700 yen cheaper than using the overseas 1day package for 3 days.

Honestly, if there is a difference of about 700 yen, I thought that international roaming would be fine, but I have experienced everything. I plan to visit the US again later this year, so I would like to keep the SIM card until then.

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Check Galaxy S8+ SC-03J information