one is enough. Usually one is to give you connectivity to the internet and the other is media storage, OR it is dual SIM for two telco, work and home for instance.
https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk00Mu6u9JvYZmW9v7f7k1LEeYc7KuQ%3A1615763226302&ei=GpdOYNr_EcTKswW3lbnYAg&q=mediatek+910+specs
your specs
Fast 4G LTE modem with Dual 4G SIM
MediaTek G90 series integrates a Cat-12 4G LTE WorldMode modem with 3x CA and 4x4 MIMO and 256QAM. This provides more reliable connectivity performance even in densely populated spaces such as stadiums, busy shopping districts, offices or airports.
Continuing our DSDS (dual SIM) leadership, essential dual 4G VoLTE and 4G data means a seamless user experience from either data connection, while VoLTE and ViLTE services provide the best possible call and live video experience, with faster call setup time noticeably better sound quality.
Advanced cellular features such as IMS (VoLTE\ViLTE\VoWi-Fi), which is now supported by over 175 cellular operators worldwide, and other standards include global eMBMS, HPUE and Band 71 support in North America.
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