Data Change - Now what?

i set on getting 32g device since pay 15 normal use (reading news on bus) or 30 when travel. here questions:

1. can cache news rss feeds on ipad using 3g? if so, app?
2. is $15 plan still month month?
3. do need att plan use wifi hotspots free?

 

1. if app cache.

2. yes

3. yes

 

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