Which CRM for in person sales?

What is the best free or cheap Android Mobile CRM app for in person sales?

Things it needs to do:

Easily save contacts with emails and phone numbers. (Preferably separate from my phone contacts list)

Keep track of emails, texts, and phone calls associated with the contact

Be able to mark the contact with something similar to "active", "follow-up", "dead", "do not contact".

Ability to make notes under each of the contacts.

Things that would be nice:

Some sort of notification when a contact calls or messages me so I will know it is a sales contact.

Ability to save photos and pdfs under the contact.

Reminders

Calender/appointment integration

Any ideas?