It's as simple as inserting an appropriate memory card - Check the Amazon web-site - there's hundreds for sale on there !
If you've been with AT&T for atleast a year it will cost you $200 and a two year contract.
To upgrade your LG Xpression 2 should not cost anything it should go along with the app. This is on a iPhone 6 Plus.
The cost will depend on who your mobile phone provider is so ask them. It should not be overly expensive as its not the latest model of the iPhone.
180$
$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
from what??