I don't know your budget, but I think a Slim Jim could work. You can get em' from Home Depot and cut a hole out of the top big enough for a cell phone and it wouldn't take up too much space. Then just slap some Cell Phone Recycling signs on the side and your done.



Slim Jim Container:
Slim Jim 23-Gallon Recycling Bin-FG3540-74BLU at The Home Depot

Order some stickers from here. I usually use Waste Stickers.com for mine, but these look good:
Electronic Recycling Signs & Labels