Hi kind folks, some advice needed.

I'm currently using a Digi postpaid plan for over 4 years, RM55 per month with unlimited calls and not sure how much internet quota, since I never run out. I'm looking for the cheapest plan by any provider with decent call and internet (I realized I don't make much phone calls anymore since I graduated). My priorities are just getting GPS working since I drive a lot, does anyone have any recommendations since I have a feeling RM55 per month is quite a lot and I'd like to save some cash.