What if I can only pay half my phone bill?

My sister can’t pay her bill, but ours combine. I pay $102, she pays $85. What happens if I only pay mine??? I usually pay the whole amount of ours combined and she pays me the same day when she gets out of work but since we have the mortgage payment(we pay to live at my parents house until we can leave) she won’t... show more My sister can’t pay her bill, but ours combine. I pay $102, she pays $85. What happens if I only pay mine???
I usually pay the whole amount of ours combined and she pays me the same day when she gets out of work but since we have the mortgage payment(we pay to live at my parents house until we can leave) she won’t have any money left over to pay her phone bill after she gives her share of the mortgage.
What will happen if I only pay my part of the phone bill?
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