not a problem. it works since i'm using a 1 gb rs mmc in my digital camera (casio). as long as you have the adaptor then you're good to go. i bought the rs mmc for my phone but when i sold the phone i kept the rs mmc. good thing since i'm still using it to this day.
Normally pupuwede kaso iyong ibang cell phone and some "older" digicams may upper limit. sa specs ng SD hanggang 2G, pero may "advanced" SD na 4G pataas.