no thats not true at all
okay the deal is the apple sim works on AT&T, sprint and t-mobile. they say once you activate the apple sim to AT&T , the apple sim can never be used on sprint or t-mobile. this is not a big deal. the iPad itself is not locked, once you decide you don't want AT&T you will need to get another sim card , or a new apple sim card
verizon didn't want to be part of the apple sim world, so if you want to use verizon, you have to use their sim card
there is no LOCKING whatsoever on any IPAD if you choose a carrier. you are free to choose whatever carrier you want and then cancel service and get a new sim card. the apple sim will let you switch between t-mobile and sprint ( and other carriers like EE and giga sky )
but once the apple sim is an AT&T sim, it is always going to be a AT&T sim
different carriers have different prices. most people now are probably on a share plan and they will just add
the iPad to their existing shared data plan for $10 a month or so.
you don't even need to activate the cellular sim card at all.
AT&T, tmobile and sprint also sell prepaid buckets of data like 5 gigs for $50 a month and once you reach the limit
the data stops and you have to wait till the next month
t-mobile is different. if you buy 5 gigs of data and use all 5 gigs, then you can continue to use the iPad at slower speeds until the next month. any data you buy like $20 for 1 gig gives you unlimited music streaming on your iPad
t-mobile will give you 200 mb of free data of the rest of your life each month, if you want. but with the free data you get no music and the data stops for the rest of the month
AT&T has a new plan where you can get 1 gig of data for 90 days for $25
t-mobile for new subscribers had this crazy plan where you can get 5 gb for $10 over 5 months. so it was 5 months or 5 gigs.
this is a good way to test the waters of other carriers.
when shopping around for other iPad plans, double check and ask if they activate your wifi hotspot.
its been a while i don't remember if you get wifi hotspot, you probably do, i just don't know
the ipad makes a good portable wifi hotspot with its 10 hour battery life
t-mobile has a plan for data stash but its only for post paid. if you activate the sim card on the iPad directly and pay each month, you won't get data stash, you have go to the store
i don't know much about sprint or verizon iPad plans, I've only used AT&T and t-mobile.
with most iPad plans the company will either shut down your iPad once you use up your allotment, or they will charge you an overage. , t-mo just slows your access
the cellular option is really good to have in case your iPad gets stolen or lost