By Brad Haynes SAO PAULO, June 17 (Reuters) - Brazilian stadiums finished just before the World Cup are holding up fine with near-capacity crowds but their cell phone networks show signs of buckling under the load. The six stadiums that were ready for a warm-up tournament in Brazil last year received public wifi networks that help to offload data traffic from congested cell networks, according to industry group SindiTeleBrasil. As a result, data traffic per person at those better-prepared stadiums has been twice as high around World Cup games, according to a Reuters analysis of the association's data. The sluggish data service at the remaining arenas, all of which were delivered after a December deadline, highlights the cost of Brazil's rushed, last-minute preparations for the tournament.

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