Connecting with loved ones in Hakone during the winter season

Hey fellow travelers! I'll be visiting Hakone with a small group of friends in December to explore its historical sites and soak up the winter vibes. We all value staying connected with our families back home, especially during the festive season. Can anyone share recommendations on where to get reliable SIM cards or pocket WiFi in Hakone? Since we'll be splitting up occasionally to explore different temples and cultural spots, having a solid communication plan is crucial for coordinating meet-up points and sharing our experiences. We want to balance our traditional experiences with the convenience of staying connected. Any tips on affordable data plans or mobile apps that work well in Hakone during winter? Thanks in advance!