How to keep track of customers on the phone?

Question

Android

Good afternoon. I often meet with clients and it is necessary to save their data and some notes (text + photo). What you want: some way of recording contacts, different from the standard one (so as not to be mixed up with the main phone numbers) I often don’t know the names of clients, and if I do, I won’t remember who it is later. Who has any thoughts on this? Android phone. Naturally two SIM cards (personal - about 200 contacts)

Answer 1

Get 2 devices and 2 SIM cards, respectively. This is the foundation.
UPD
The one that needs to be able to quickly work with a large phone book for work. In the phone book, one of the most important functions is checking for a duplicate when adding contacts, that this phone number is already in the database. You also need a customized synchronization of the phone book with the cloud, so that it would not be excruciatingly painful from the loss of achievements acquired by overwork. Surely you need an organizer to automatically remind you when and with whom to contact. Other applications to a minimum, so as not to take up phone resources. Additionally, I recommend purchasing an external battery on micro-USB, this will help save the deal at the right time.
Otherwise, rely on your habits. I won’t recommend a specific model, you need to test it, but it seems to me that inexpensive Chinese models like Xaomi will suit you.

Answer 2

Use the phone book of your mobile phone.

Answer 3

The usual address book of the android completely implements this:
If you want something more than a built-in android application, there are a bunch of applications on google play that work with the address book. I, for example, use Rocket dialer for its ability to show the name of the organization and the title of the incoming call.

Answer 4

https://ru.opencalls.me/ - save calls and comments to them in Google.Drive. The names will be taken from the address book.