Calling just to "check in" isn't a relevant reason unless your prospect has specifically asked you to. It's just a lazy excuse to get someone on the phone and it hardly ever works. Instead, find common ground between you and your leads.
1. Instead of saying, "Sorry this is late," say, "Thanks for your patience." "Using positive language in a negative situation can have a big impact on how you're remembered."

Many busy businesses utilize auto attendant greetings to make a great first impression, however, if your business relies on the personal touch of a live receptionist, it is important to have a plan in place when that position is unstaffed. Make sure your voicemail greeting contains the useful information that your receptionist would normally provide. This could include: location & directions, office hours, website URL, or social media info, as well as any pertinent company information.
A word of warning: These greetings will not do you any favors if you're in the midst of a job hunt or work in a conservative industry. Always remember your target personas. If there's a chance they won't appreciate your sense of humor, opt for a straightforward greeting instead.