4S for biking SE Asia & China

what's best way use 4s map navigation off- , on-line in bush? hear can't it. true? must buy garmin , use both.

out there using iphone 4s in weird places no coverage maps?

how sim cards? googled them , theirs trillion. here, people local one. last time in china got ripped off doing that.

i'm trying homework. have input on best sim cards thailand, cambodia, vietnam, laos, , china?

include both voice , data? appreciated.

 

by coverage, referring cell reception? download navigon. work without data. not sure how great maps going be, assume off road. know garmin maps "off-road" gps maps/units, unsure if made iphone. anyway, point gps work fine without data, long load app has preloaded maps.

 

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