It’s Part 2 of the roaming review of Singapore’s local SIM card. Just like the Roaming Review done for South Korea in the previous article, this article will share which is the best SIM to roam in Japan with.
Take your pick below!
Postpaid Roaming
| Provider | Best Rate | Validity | Note |
| SingTel | 2GB for $20 | 30 days | N.A. |
| StarHub | 3GB for $20 | 30 days | N.A. |
| M1 | $25 Data Passport i.e. on a $25 for 30GB SIM-only Plan 1GB for $1.67 | Monthly Cycle | Data is from local bundle |
| TPG | No roaming to Japan yet | ||
| Circles.Life | 100MB for $5 | PAYG | N.A. |
| GOMO | 2GB for $10 | 10 days | N.A. |
| giga! | 1GB for $5 | 5 days | N.A. |
| Zero1 | 1GB for $18 | 30 days | N.A. |
| Zero SG | No roaming services | ||
| MyRepublic | 1GB for $20 | 30 days | N.A. |
| redONE | 1GB for $614.40 (based on $0.60 per MB) | PAYG | N.A. |
| Vivifi | 1GB for $35 | 30 days | N.A. |
| Grid Mobile | 1GB for $18 | 30 days | N.A. |
Prepaid Roaming
| Provider | Best Rate | Validity | Note |
| SingTel | 2GB for $28 | 30 days | N.A. |
| StarHub | 4GB for $25 | 30 days | comes with 16GB local data 4GB can be used in SG free 10GB in SG every Sunday |
| M1 | 2GB for $28 | 10 days | 10 minutes overseas call |
| Vivobee | no roaming services |
Just like travellers to South Korea, the best local SIM to bring to Japan would still be M1’s 30GB SIM-only plan as with the $25 Data Passport added on, you would be able to use your entire data bundle in both Singapore and Japan. This means that your per GB price will be driven down to $1.67 and after coming back to Singapore, you will still be able to continue using your remaining data bundle. After all, since your local data bundle is unused in Singapore while you are in Japan, you might as well bring it there to use.
If you’re a GOMO or giga! user, the rates offered are also attractive as add-ons. GOMO users can purchase Japan roaming at 2GB for $10 for 10 days while giga! users can purchase it at 1GB for $5 for 5 days, which means that both roaming products are pretty similar, except that GOMO’s is slightly better.
If you are using other Postpaid options, there is no need to port out to M1, GOMO or giga! to use the roaming services to Japan. Simply purchase a StarHub Happy SIM and purchase the 20GB for $25 data plan. This will give you 4GB to roam in Japan, and 16GB in Singapore. Additionally, you also get 10GB free in Singapore on Sundays. If you have any remaining data from the 4GB after coming back from Japan, you can use the leftover data in Singapore as well.
The following table shows the recommended options to Japan as discussed above.
| Provider | Type | Product | Data & Price | Validity | Price/GB | Other Benefits |
| M1 | Postpaid | $25 Data Passport | N.A. | Monthly | $1.67 | Unused data can be used in SG |
| GOMO | Postpaid | Roaming Data Pump | 2GB for $10 | 10 days | $5 | N.A. |
| giga! | Postpaid | gigaRoam APAC | 1GB for $5 | 5 days | $5 | N.A. |
| StarHub | Prepaid | WOW Data Plan | 4GB for $25 | 30 days | $6.75 | Unused data can be used in SG. 16GB more in SG. free 10GB in SG every Sunday. |
Singapore Telcos 