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Simsima plans for Japan

2,743 live plans from 24 providers, ranked on what a gigabyte actually costs rather than on the sticker price. Checked 27 August 2026

Compare 2,743 plans →
£0.21 Lowest per GB Cheapest honest gigabyte here
£1.35 Median per GB Unlimited and fair-use excluded
£0.76–2.98 Typical band Where most plans land
52% Advertise 5G 85% allow hotspot

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We earn a commission on some links below. Commission carries zero weight in the ranking formula, which is published in full. Prices are indicative and the provider's own checkout is always authoritative.

Showing 32 of 2,743 plans

View offer: Simsima, Unlimited - 30 days 1 Simsima Unlimited - 30 days 3 GB/day 30 days 5G Japan only £30.63 £0.34 per GB
View offer: Simsima, Japan 50GB 30Days 2 Simsima Japan 50GB 30Days 50 GB 30 days 5G Japan only £33.71 £0.67 per GB
View offer: Simsima, Unlimited - 10 days 3 Simsima Unlimited - 10 days 3 GB/day 10 days 5G Japan only £14.95 £0.50 per GB
View offer: Simsima, Unlimited - 30 days 4 Simsima Unlimited - 30 days 3 GB/day 30 days 5G +17 more countries £50.46 £0.56 per GB
View offer: Simsima, Unlimited - 7 days 5 Simsima Unlimited - 7 days 3 GB/day 7 days 5G Japan only £11.77 £0.56 per GB
View offer: Simsima, Japan 10GB 30Days 6 Simsima Japan 10GB 30Days 10 GB 30 days 5G Japan only £12.32 £1.23 per GB
View offer: Simsima, Japan 50GB 90Days 7 Simsima Japan 50GB 90Days 50 GB 90 days 5G Japan only £47.37 £0.95 per GB
View offer: Simsima, Japan 20GB 30Days (IIJ) 8 Simsima Japan 20GB 30Days (IIJ) 20 GB 30 days 4G Japan only £16.18 £0.81 per GB
View offer: Simsima, Unlimited - 10 days 9 Simsima Unlimited - 10 days 3 GB/day 10 days 5G +17 more countries £23.88 £0.80 per GB
View offer: Simsima, Japan 2GB/Day FUP1Mbps (15 Days) 10 Simsima Japan 2GB/Day FUP1Mbps (15 Days) 2 GB/day 15 days 5G Japan only £27.92 £0.93 per GB
View offer: Simsima, Japan 5GB 30Days 11 Simsima Japan 5GB 30Days 5 GB 30 days 5G Japan only £7.30 £1.46 per GB
View offer: Simsima, Japan 1GB 7Days 12 Simsima Japan 1GB 7Days 1 GB 7 days 5G Japan only £2.63 £2.63 per GB
View offer: Simsima, 50 GB - 90 days 13 Simsima 50 GB - 90 days 50 GB 90 days 5G +17 more countries £47.37 £0.95 per GB
View offer: Simsima, Unlimited - 7 days 14 Simsima Unlimited - 7 days 3 GB/day 7 days 5G +17 more countries £18.49 £0.88 per GB
View offer: Simsima, Japan 3GB 30Days (IIJ) 15 Simsima Japan 3GB 30Days (IIJ) 3 GB 30 days 4G Japan only £5.78 £1.93 per GB
View offer: Simsima, 3 GB - 30 days 16 Simsima 3 GB - 30 days 3 GB 30 days 5G +17 more countries £6.93 £2.31 per GB
View offer: Simsima, 20 GB - 30 days 17 Simsima 20 GB - 30 days 20 GB 30 days 5G +17 more countries £26.58 £1.33 per GB
View offer: Simsima, 1 GB - 7 days 18 Simsima 1 GB - 7 days 1 GB 7 days 5G +17 more countries £2.68 £2.68 per GB
View offer: Simsima, Japan 100GB 180Days 19 Simsima Japan 100GB 180Days 100 GB 180 days 5G Japan only £130.94 £1.31 per GB
View offer: Simsima, 10 GB - 30 days 20 Simsima 10 GB - 30 days 10 GB 30 days 5G +17 more countries £16.94 £1.69 per GB
View offer: Simsima, 100 GB - 180 days 21 Simsima 100 GB - 180 days 100 GB 180 days 5G +17 more countries £130.94 £1.31 per GB
View offer: Simsima, 5 GB - 30 days 22 Simsima 5 GB - 30 days 5 GB 30 days 5G +17 more countries £10.01 £2.00 per GB
View offer: Simsima, 20 GB - 30 days 23 Simsima 20 GB - 30 days 20 GB 30 days 5G +192 more countries £46.22 £2.31 per GB
View offer: Simsima, 1 GB - 5 days 24 Simsima 1 GB - 5 days 1 GB 5 days 5G +192 more countries £4.13 £4.13 per GB
View offer: Simsima, Japan 100MB 7Days 25 Simsima Japan 100MB 7Days 0.1 GB 7 days 5G Japan only £1.10 £11.00 per GB
View offer: Simsima, 10 GB - 30 days 26 Simsima 10 GB - 30 days 10 GB 30 days 5G +192 more countries £33.00 £3.30 per GB
View offer: Simsima, 20 GB - 365 days 27 Simsima 20 GB - 365 days 20 GB 365 days 5G +192 more countries £62.23 £3.11 per GB
View offer: Simsima, Japan 5GB 60Days 28 Simsima Japan 5GB 60Days 5 GB 60 days 5G Japan only £24.93 £4.99 per GB
View offer: Simsima, 3 GB - 30 days 29 Simsima 3 GB - 30 days 3 GB 30 days 5G +192 more countries £16.56 £5.52 per GB
View offer: Simsima, 5 GB - 30 days 30 Simsima 5 GB - 30 days 5 GB 30 days 5G +192 more countries £22.00 £4.40 per GB
View offer: Simsima, 1 GB - 7 days 31 Simsima 1 GB - 7 days 1 GB 7 days 5G +192 more countries £6.59 £6.59 per GB
View offer: Simsima, 5 GB - 60 days 32 Simsima 5 GB - 60 days 5 GB 60 days 5G +192 more countries £24.93 £4.99 per GB
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