I would highly recommend Airave. If you work from home it is killer because for a small monthly fee you get unlimited calling from home. I have fairly good sprint singnal at home but got the airave for free and the $5 per month waived. I pay $20 a month to get unlimited Airave calling on our five lines. We got rid of our two landlines as a result (one home and one home office) and now use about 4,000 prime time minutes a month more without touching our minutes on our a 1000 minute five line plan. It made sense to get an additional Sprint line for $10 more a month since its minutes are already included in the airave unlimited family charge of $20

$20 Airave monthly fee for unlimited calling
$10 Adding an additional fifth Sprint mobile line to our plan
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$30

-$110 Prior landlines monthly cost
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$70 Savings