There's talk that the type of sim card you have may be related to the signal issues...I know, it doesn't seem to make any sense, but neither does Apple releasing an iPhone in its current state either, so bear with me.
Please know that coloring may vary slightly, but the layout of the contacts is what (might be) important.
EDIT: For some background, this idea originated from a macrumors poster who mentioned that his signal issues went away when AT&T replaced his sim.
Please know that coloring may vary slightly, but the layout of the contacts is what (might be) important.
EDIT: For some background, this idea originated from a macrumors poster who mentioned that his signal issues went away when AT&T replaced his sim.