Winterboard theme that changes your network icons (4G, LTE, EDGE, 3G) to dots to go with the excellent Signal Dots theme. Tested to work on iOS 6 on an iPhone 4S. If you have any issues let me know.
Note: If you also have the Signal Dots theme installed, make sure that in Winterboard this tweak is on TOP of Signal Dots. For some reason the author of Signal Dots included the stock icons in his theme and they override any modifications if placed on top of the list.
Apply with Winterboard