I also got my Z1 without a contract, so I'm using a prepaid carrier. (dna super prepaid)
Each month I put 20€ on my account, and then I buy a 21Mb/s unlimited internet that is 16€/month.
That leaves me with a whopping 4 euros to use for my calls and texts, but it's more than enough. (I mainly use Whatsapp for communication)
Calls and texts are 0,06€ per minute/each.
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