Why 4 phone numbers?

Why would a person have 4 phone numbers? One for calls and texts, one for tablet. But why another for only texts, and then yet another for only data transfer?
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Here in Australia depending on the prepaid plan it gives you special deals on the money applied to that account. For instance on Telstra you get on a 'data plan' you can choose a spend of 50$ that allows 5 gb of data for 12 months, otherwise you burn it at a faster rate, or it will expire monthly
Thomas GrassiSystems AdministratorCommented:
If they download apps those apps can assign a different number

I have a Textnow app which I use to text to non iPhone friends

That has a separate number

As it happens, I (i.e., my wife and I) have four phone numbers. We have two land lines to our home and each has a cell phone. The numbers weren't specifically chosen for dedicated purposes as the question asks, but we've slowly managed to turn different numbers into their own services. It's just turned out to be handy as long as we have them anyway.

As for why someone else might do it, I'm not sure how we could be expected to know.
Neil RussellTechnical Development LeadCommented:
Maybe they want to hide something from their partner!
If it is not a question of hiding as Neilsr suggested, then may be next logical explanations:
- In Europe, for instance Germany, I have different SIM cards with different numbers because some offer cheap calls abroad.
- Some new mobile phones, smartphones, are cheap as 1€ if you buy them in rates with a plan for 2 years and you receive a new SIM/mobile number. Then in few years you can have several numbers.

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