Isekai wa Smartphone to Tomo ni.
In Another World with My Smartphone

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-Both MCs were transported to another world -Male leads took their smartphone with them -Both smartphones are pretty usefull to the MC -Male MCs and female MCs are strong in both stories -Male leads are accompanied by a lot of girls -Both stories take place in a fantasy world filled with magic, andventurers etc. 

Both have: - MCs that gets an abnormal death - MC meets a god and reincarnate them to another world - worlds that use magic instead of electricity kind of thing - MCs has multiple magic (you probably know how many just by guessing), and sometimes uses a sword to fight instead - first female acquaintance(s) they make is in trouble and then they save them - action, adventure, and fantasy - MCs use their knowledge from their previous world to this other world I'd say I like Skill Board wo Kushi better, but they're both nice imo. 

Both set in fantasy-like worlds. "Isekai wa Smartphone to Tomo ni." has a MC that dies and get to lives in a new world with his smartphone. "Yasei no Last Boss ga Arawareta!: Kokuyoku no Haou" is about a guy getting stuck in a game is his OP female character. 

Both are set in a fantasy world. "Isekai wa Smartphone to Tomo ni." has a MC that dies and get to lives in a new world with his smartphone. "Koushaku Reijou no Tashinami" is about a girl getting reborn into an Otome Game as the villianess and avoids her fate and uses her old world knowledge to better the land her father hands to her.