Originally Posted by solipsism
The addressable market is ONLY the customers that the carrier currently has? The "official" addressable market should be the entire population of those countries, especially since the latest rumours state quite convincingly that there will be no vendor lock in or revenue sharing, just distribution agreements.
I don't think that makes sense either. For the most accurate number of potential iPhone customers, They need to count all the current mobile phone subscribers in the country as the "addressable market".
First of all, this metric only counts the people that actually have an existing cell phone account, thus filtering out (most) segments of the population that won't become iPhone customers (children, poor, etc). More importantly, this metric also takes into account all of the potential iPhone customers that currently have mobile phone accounts with carriers other than the official iPhone carrier(s).
The analyst in the article only counts the mobile phone subscriber base of the carrier(s) that have specifically announced future iPhone availability.
This is a stupid way to do this, as we have seen with AT&T that many of their iPhone subscribers are new to the network, having switched from other carriers
such as T-mobile, Verizon, et all. IIRC, the number was around 30%.
I am going to crunch some numbers later, but I would guess that with my simple method of also counting "potential switchers", the "addressable market" for the iPhone would increase by at least 50% ~500 million cited.
Originally Posted by calguy
Once the AT&T combine is past the exclusive stage, how about an iPhone that will be usable on other networks or have multiple frequencies built in for great roaming and if the original contract carrier is not available any other carrier can be used. Of course, the carriers themselves would have to agree to this which I think is a great idea.
...The various frequencies technically is one major hurdle, but if they can make scanners that you can dial in any frequency within a certain range, why can't the same be true with a phone?
Well, I don't doubt its possible to make a phone capable of operating in all the bands, but it would most likely add a lot to the cost of the radio chips. What you are really describing is something called "software defined radio" (SDR), in which a radio system would have adaptable hardware antennae whose's operating frequency and multiplexing scheme (TDMA, CDMA, OFDMA, etc) are controlled by software. This would be great for not just phones, but other wirelesss equipment in that they could constantly monitor their surrounds and adapt transmissions for best possible signal. Of course, this would mean that both ends of a transmission would have to be able to communicate and tell each other what frequency bands to switch to.
Anyways, back to the present for a moment. It would most likely be much easier to develop a radio chip capable of operating on all the frequency bands of a particular technology, say UMTS/GSM or CDMA (CDMA2000), but NOT both. Throughout the world, there are many frequency bands that CDMA, GSM, and UMTS operate on, frequently divided up by region. Usually North America, South America, Europe, Middle east+Africa, and Asia. Australia and New Zealand are split between North America and European tech. Now of course, this is not true for all cellphone technology and there are many exceptions. To show you how complicated this can get, here's just the USA:Verizon Wireless
CDMA 1xRTT (2.75G) = 800Mhz
EV-DO rev. A (3.5G) = 800+1900mhz (independent upload/download bands)
CDMA 1xRTT (2.75G) = 1900mhz
EV-DO rev. A (3.5G) = 1900mhzAT&T
GSM+EDGE = 850Mhz or 1900Mhz (same band for both upload/download)
UMTS = 850 or 1900Mhz (same band for both upload/download)T-Mobile
GSM+EDGE = 1900Mhz
UMTS 1700+2100Mhz (independent upload/download bands)
and here is all the current frequency bands for the popular technologiesWorld GSM operating bands
= 450Mhz (Scandinavia), 850Mhz (USA/Canada), 900Mhz (Europe), 1800Mhz (Europe), 1900Mhz (USA/Canada)World UMTS operating bands
= 800Mhz (Japan), 850Mhz (USA/Canada/Australia), 900Mhz (Europe), 1700+2100Mhz (USA T-Mobile), 1900Mhz (USA/Canada), 2100+1900Mhz (Europe)World CDMA2000 operating bands
= 450Mhz, 450+800Mhz, 450+1900Mhz, 700Mhz, 800Mhz, 800+1900Mhz, 850Mhz, 1700Mhz, 1900Mhz, and 2100Mhz