LG 500g Lanyard hole
Is there a hole in the phone I can put my cell strap + the attached keychains on?
Yes, there's a lanyard hole, in fact a single hole, unlike the usual double hole in other phone such as, for example, the LG 900g, where you slide it through and make a loop on the outside.
On the 500g, you have to open the back, slide the lanyard string through the single hole and hook it around a small piece of plastic that sticks up. Once in, putting the back on secures it in place. Actually, it's pretty secure even without the back as I had a heck of a time getting the lanyard back out to put back on my camera.
You can see a photo of it above.
I think the single hole makes for a cleaner look because you don't have a visible loop on the outside.
Hope this helps.