Great news (rumor) after the failed AT&T & T-Mobile merger, T-Mobile should be granted to use some of the AT&Ts spectrum to be compatible with the iPhone 3G frequency.
Category: Mobile Devices
iOS 4 pdf vulnerability
Another reason to jailbreak 
If your iPhone or iPad is free from apple you can protect yourself against the PDF vulnerability.
Here is more info:
http://www.iphonehacks.com/2011/07/insta…ility.html
Here is more info:
http://www.iphonehacks.com/2011/07/insta…ility.html
The other option is not to open PDF files from untrusted sources and wait for apple to fix it.
iPhone stand
The simplest and most portable design I found is done from a business card. (This one requires some work 
)
Here is the link: http://www.instructables.com/id/Simple-b…Pod-stand/
My second choices:
BatRest iPhone folding stand I found on thinkgeek is listed as a iPhone 3G compatible but after talking to the customer support I was assured it works with iPhone 4.
I will update after I test it out myself. here is the link: http://www.thinkgeek.com/gadgets/cellphone/b6f5/
There are couple more choices but the two first choices I listed are the same size as a business card and will easily fit in my compact wallet.
other options:
http://www.myibend.com/
http://www.seskimo.com/index.php
Apple unlocked iPhone 4 in the US
Apple unlocked iPhone 4 in the US
Will this happen on Wednesday 6/15/11 ?
update: Apple Store
unfortunately it is only GSM phone with the limitations listed below.More and more sources are reporting this info about factory unlocked iPhone.
Already many countries around the world sells unlocked iPhone and the closest one is Canada.The bad news would be high price ~ 600 additionally there is no information indicating if the phone would be both GSM and CDMA as well as no indication about including 1700mhz frequency which is missing for 3G usability on the t-mobile network in the US.The good news would be for the GSM version of the phone there is no need for contract on ATT, usable as a phone around the world without the hustle of software/ hardware unlock.http://www.zdnet.com/blog/btl/unlocked-i…ag=nl.e550
http://www.amazon.com/Apple-16GB-Quadban…769&sr=8-2
https://vrpc.com/att-vs-t-mobile-frequency/
update: Apple Store
unfortunately it is only GSM phone with the limitations listed below.More and more sources are reporting this info about factory unlocked iPhone.
Already many countries around the world sells unlocked iPhone and the closest one is Canada.The bad news would be high price ~ 600 additionally there is no information indicating if the phone would be both GSM and CDMA as well as no indication about including 1700mhz frequency which is missing for 3G usability on the t-mobile network in the US.The good news would be for the GSM version of the phone there is no need for contract on ATT, usable as a phone around the world without the hustle of software/ hardware unlock.http://www.zdnet.com/blog/btl/unlocked-i…ag=nl.e550
http://www.amazon.com/Apple-16GB-Quadban…769&sr=8-2
https://vrpc.com/att-vs-t-mobile-frequency/
Cell Towers
It is not always easy to know the location of nearby cell towers.
If you need this info here is one link which can help:
All US cell carriers:
http://www.cellreception.com/towers/or one for T-Mobile towers:
http://t-mobiletowers.com/towersearch.as…&zip=90025
All US cell carriers:
http://www.cellreception.com/towers/or one for T-Mobile towers:
http://t-mobiletowers.com/towersearch.as…&zip=90025
AT&T VS T-Mobile Frequency
T-Mobile
Frequency on UMTS (W-CDMA)/HSPA 3G (not true 4G)
1700 MHz/2100 MHz
Frequency on GSM/GPRS/EDGE 2G
850 MHz and 1900 MHz
http://en.wikipedia.org/wiki/T-Mobile_USA
1700 MHz/2100 MHz
Frequency on GSM/GPRS/EDGE 2G
850 MHz and 1900 MHz
http://en.wikipedia.org/wiki/T-Mobile_USA
AT&T
Frequency on UMTS/HSPA 3G
850 MHz/ 1900 MHz
Frequency on GSM/GPRS/EDGE 2G
850 MHz and 1900 MHz
http://en.wikipedia.org/wiki/AT&T_Mobility
Free your iPhone from Apple
good links to start:
http://blog.iphone-dev.org/
http://www.iphonehacks.com/
http://iclarified.com/tutorials/iphone/index.php
http://www.iphonehacks.com/
http://iclarified.com/tutorials/iphone/index.php
Make sure to read carefuly if you need your phone to be unlocked and used on different cell provider beside ATT.