I am using an 8GB Micro SDHC card in my Shadow (original shadow, not shadow II), and I can fill and read the entire 8GB.
T-Mobile has informed me that the Shadow can only support up to a 4GB Micro SD. While Mike Benton from allshadow.com and pocketnow.com says it can support an 8GB Micro SDHC. WMExperts.com agrees with Mike and tells me that it can support the 8GB Micro SDHC too. My friend tells me that while it can accept the 8GB Micro SDHC, it can only use/read 4GB of it and not the full 8GB. Has anyone tried the 8GB Micro SDHC card with their shadow? and does it completely fill it up? if so does it slow down the phone very much? thanks