Chelsea Groton Bank will NEVER contact you by phone call or text to verify your identity or ask for personal, debit card, or online banking login information. Beware of phone calls and text messages appearing to be from Chelsea Groton Bank headquarters and branch phone numbers where the caller claims to be from the Bank and asks for your personal or financial information. If this happens, hang up and call us at 860-448-4200 so we can verify the security of your account.