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With the cost of airtime cellular service is more costly than landlines, but most carriers offer attractive pricing options that effectively eliminate roaming and long-distance costs. Do we need "is more costly" or "more costly", please advise.
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The whole thing needs a little more work-- you need to get rid of both 'is' and 'but':

With the cost of airtime cellular service more costly than landlines, most carriers offer attractive pricing options that effectively eliminate roaming and long-distance costs.
Couldn't we replace "more costly" by "more expensive"?
Students: Are you brave enough to let our tutors analyse your pronunciation?
Indeed we could, but I don't believe that that is to our Guest's purpose.
Shore, sorry, sure.
Don't youstart with the "shore/shorely" stuff! Emotion: rolleyes
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Sorry, Ma'am, the very first one was addressed to ME!
I'm entitled to refer to it if I choose!
Oh well - OK then! If it's yours, I suppose you can use it. Just don't use it annoyedly![A]
Me? Never! Emotion: smile
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