Dimension scores are derived from public data and fields; weighted into the composite. Reference only.
イプシム is a high-speed Japanese MVNO mobile data SIM from WITH Networks, running on NTTドコモ’s LTE 4G network. Its core value is not email marketing or SMS gateway functionality, but the fact that each SIM is assigned one fixed public IPv4 address, allowing mobile devices to function as stable, identifiable access points.
At the network-service level, this is primarily a data communications product. Voice SIMs are explicitly not offered, and new applications for the SMS option have ended; only existing SMS option users can continue adding SIMs with SMS. Coverage spans NTTドコモ’s nationwide LTE area in Japan. In terms of performance, standard data plans offer up to 450Mbps downlink and 50Mbps uplink, throttled to 200kbps after the allowance is exceeded. The unlimited plan runs at 200kbps for both download and upload, with burst transmission available at 200kbps. The fixed IP setup is suitable for VPN, SSH, remote desktop, monitoring devices, remote monitoring of solar equipment, IoT/M2M, and two-way communication with the cloud.
Pricing is transparent, with the monthly fee made up of a base fee plus a fixed IP usage fee. The 200kbps unlimited plan starts from 990 yen/month, the IoT 100MB plan is 1050 yen, 1GB is 1190 yen, 3GB is 1330 yen, and the highest 10GB plan is 2590 yen, with tax-inclusive prices also listed separately. From the second SIM onward, the fixed IP usage fee is 50 yen cheaper per month. The initial cost is 3894 yen per SIM, and extra data costs 1000 yen per 1GB. Payment is supported by credit card and bank transfer.
The advantages are fixed public IPv4, availability for both individuals and companies, support for data rollover, high-speed ON/OFF switching, free plan changes, reverse DNS changes, and the ability to switch to a dynamic private IP to reduce costs when a fixed IP is not needed. The drawbacks are that the service is highly Japan-focused, IPv6 has not yet launched, SMS capabilities are limited with no delivery-rate data, some applications such as P2P are unavailable, and speed restrictions may be triggered based on traffic usage over the most recent 3 days.
It is suitable for IoT devices deployed in Japan, remote monitoring, mobile office scenarios requiring a fixed source IP, wireless WAN backup lines, and development/testing teams. It is not suitable as an SMS, email, or IM communication platform for users in China. The network accessibility of its website and member system from mainland China is not stated in the available text, so it is assessed as unknown. For practical business alternatives, users may consider IoT SIM cards from China’s three major carriers, enterprise APN/VPN private lines, or cloud-provider IoT solutions.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on ipsim.net official site.
ipsim.net is an Japan Comms & Email (Fixed Ip Mvno Sim) provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach ipsim.net directly.