Mobile intercom services

We are searching for a mobile which can be given to security guard who can dial restricted numbers of house owners

i.e. he can make outgoing call and can receive incoming calls which are enlisted /authorised/stored in phone book.

barred to make all other outgoing call and receive incoming calls

Can be used like wireless intercom system.
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More about mobile intercom services
  1. You can setup blocked lists using any phone company, just contact the service provider.
  2. i believe the best people who can help you with this query is Service Providers.
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