four times
you only can upgrade any weapon once
With AT&T there are many options to upgrade your phone. Every 24 months, you are eligible to upgrade your device for a subsidized price. Alternatively, you could trade in an old device for a new one.
3
3
as many times as you like
there is a silver and a gold, so ,twice.
There are many places where one can get cell phone upgrades. Upgrades for cellphone software are usually available from an application on their phone. If one wishes to upgrade to a new phone they can do so from their phone provider.
Many are available at no cost to you, but you will have to contact your service provider for the correct information.
Sometimes 10 or 40
Passengers are generally allowed to bring one personal cell phone on a plane.
Yes you can. But I am not sure how many times each upgrades
"Mobile Upgrade" for many cell phone companies means that you're eligible to get a new phone at a reduced cost. For example, Verizon customers (and I'm sure this is basically how it works with every other provider) when they are eligible for an upgrade, they can get a new cell phone at the cost someone would pay if they started a NEW contract with the company (the website shows the various prices). However, for many providers, this also extends your contract for another two years so be careful and read the fine print!