On average, how often are wireless cellular networks upgraded (2G, 3G, 4G, LTE)?
How far along do you think networks will be upgraded before they reach a peak?
Are you, personally, willing to upgrade wireless networks (and ultimately having to upgrade your device to support the change) every year?
First off: you're not going to see cellular networks upgrading every year. It costs Billions (that's right, capital b) of dollars for the Tier 1 carrier to do upgrades to their network, including purchasing spectrum, fitting out new backhaul and then upgrading the actual cell sites. It's an even greater sticker shock for them to upgrade than it is for you to get a new phone.
You will see incremental updates to current technologies. HSPA will get faster speeds and so will LTE. Even EDGE, technically, can be upgraded. But those won't be major shifts that obsolete existing phones.
If you wanna know the timeline:
- 2G (cdmaOne, TMDA/IS36, GPRS, EDGE) has been around as early as 1991, with 1995-96 being when it really took hold in the US. To this day, parts of networks across the globe still have 2G, and it'll probably be a few years yet before it starts getting really scarce.
- 3G started in 2001. UMTS was first (in '01 but AT&T didn't start offering it until 2005), and CDMA2000 officially began rollout in 2002. To this day, some areas or the US and the world lack 3G coverage, even though they are covered by a 2G network.
So basically, 3G is about 11 years old, and will probably continue to be around for some time. I'd say 5-10 more years,
at least.
- LTE (what carriers are calling "4G") began its first rollout in 2009. It's likely to stick around at least as long as 3G has.
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True 4G actually doesn't exist yet. The official ITU spec requires 4G to have a minimum speed of 100Mbps (but they caved on political pressure and allowed slower networks like HSPA+ and LTE to be marketed as "4G"). LTE Advanced might hit that speed, when it's rolled out, but should remain backward compatible with existing LTE phones.
Bottom line: Your iPhone 3G, 3GS, 4, 4S or 5 will probably fail as a result of some equipment problem LONG before most networks decide to make them obsolete on the cellular side.