Coming from a Evo 4G LTE...does a custom rom break 4G service ?

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http://forum.xda-developers.com – I just the S3..Love it...I had a Evo 4G LTE and it was rooted, unlocked and flashed with a custom. To put custom ROM's on the Evo LTE you'd lose 4G service. Is this the same with the S3 ? Thanks in advance guys :D (HowTos)