Discuss Smartphone app in the UK Electrical Forum area at ElectriciansForums.net
The type of applications you're talking about are known as CRM apps. They manage your customer database between different sections of a company and they often get very complicated and involved very quickly.
Google Contacts has some basic CRM features wrapped into it and might suit your needs. Also Google Sheets can be used as a basic customer management tool or you can set up your own or you can cheat and download a ready made one for free.
If you want a fully function CRM application for free, there are some around but as Calpol mentioned there's usually a price to pay somewhere.
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