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If you've been with AT&T for atleast a year it will cost you $200 and a two year contract.
To upgrade your LG Xpression 2 should not cost anything it should go along with the app. This is on a iPhone 6 Plus.
The cost will depend on who your mobile phone provider is so ask them. It should not be overly expensive as its not the latest model of the iPhone.
It's as simple as inserting an appropriate memory card - Check the Amazon web-site - there's hundreds for sale on there !
180$
$200 with a two year plan
$199
us$50-100
200.9
The apple iphone will cost about 400 - 500 dollars. :.
in the range $400-$523
only your phone company can answer that question