Hi,
1. You can use out box search capability, maybe simple quick fine and search based on unique information like phone number, you can implement multientity search capability, there are addons available for the same in market. (MS CRM 2013 have this feature
OOB)
2. you could do some development which will validate on create of entity record if the same information is already exists in system or not, if found show message with details.
HTH
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Microsoft Dynamics CRM 2011 Application Design
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