Mobile devices of any kind are allowed by the site to download creations of under 600 parts. As for your own designs, lights take more resources than blocks and a crash (explosion) may crash the app. A phone like that, with 1.5GB of RAM, you're looking at about 400 as the highest partcount with optimal performance, but YMMV.
More than 300 Parts make the Phone Laggy
Mobile devices of any kind are allowed by the site to download creations of under 600 parts. As for your own designs, lights take more resources than blocks and a crash (explosion) may crash the app. A phone like that, with 1.5GB of RAM, you're looking at about 400 as the highest partcount with optimal performance, but YMMV.