Is this $45/line the true cost and what is add-on?

True cost per line. What are the add on. What is exact bottom line

Looks like it's fixed at $45 per line + taxes + $10 per line monthly charge applies if at least one of the following post-pay subscriptions are not maintained on the account: XFINITY TV, Internet or Voice service. Pricing subject to change. Actual speeds vary and are not guaranteed. Note that after 20 GB monthly data use, speeds reduced to a maximum of 1.5 Mbps download/750 Kbps upload. (source) Unlimited talk and text is also included.

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