QUOTE(pikacu @ Feb 28 2012, 05:15 PM)
nothing wrong with microsim already...as microsim adapter available outthere to fit normal sim phone...
the direction going towards microsim now...just like now the direction of SD card change to microSD

This article is mainly for ip4s. ..
“As the voltage is different, the 2G SIM cards on 3G mobile phones using the iPhone 4 will affect their life” – Recently, China iPhone 4 story so many users are upset that they are the 2G SIM cards on the iPhone 4 in use. However, Apple recently issued a notice denying that “2G SIM card can not use the iPhone 4, otherwise do not enjoy the warranty and other services.” The industry also said that from a technical analysis, the above is not valid.
Latest rumors
iPhone 4 with a 2G SIM card does not match the voltage
iPhone 4 to set off in the global smart phone cyclone, more and more 3G users iPhone 4. It is reported that many users will the existing 2G SIM card through the cut card format, launched by operators to buy Micro-SIM card, etc., into the iPhone 4 in use. And recently, one can not use the iPhone 4 2G card caused a lot of attention to the rumors.
According to related rumors, Apple recently said the official staff, cut the 2G SIM card phone card to use the iPhone 4, there does not match the voltage of the problem, it will affect Apple’s battery life. Therefore, if the 2G SIM card cut card in the iPhone 4 mobile phone use caused damage to the machine, lock machine, and all the consequences of data loss, Apple will not be responsible for the sale.
It is understood that the official Apple rumor staff explained that, iPhone 4 must be used on international standards, the 3G SIM card is 3V. And the current 2G SIM is 1.8V, and with the presence of voltage does not match the iPhone 4 issues, will affect battery life. The report also said that some users have been reflected in the iPhone 4 cut SIM card installed, the phone appeared in a series of instability. The root causes of these phenomena is the installed 2G cut card, cause voltage instability iPhone 4, this operation will not only affect the life battery life, but also easy to lock unit may result in phone, and if serious consequences is the loss of data.
Apple
Denied the rumors do not provide warranty
However, these reports have not been confirmed. The reporter called Apple after-sales service, the answer is, at present they do not notice that “2G SIM card can not be used on iPhone 4, otherwise do not enjoy the warranty and other services.” Apple also said that they meet the sale terms, will provide maintenance, which does not consider the use of the SIM card.
Are familiar with the smart phone industry, told reporters that Apple’s iPhone as a smart phone, it automatically at startup voltage detection, and SIM card itself will work to support the voltage, so 1.8V voltage will not have phones have a major impact, relevant reports, and credible.
In addition, according to report, according to ISO7816, GSM11.11 other international common industry standards, international standards SIM card supports 1.8V, 3V, 5V power supply voltage such as 3, mobile phone manufacturers and SIM card manufacturers can choose the type of support. There are no SIM card, a SIM card vendors only support 1.8V power supply. Because of numerous mobile phone manufacturers in particular cottage machine manufacturers support only 3V. Therefore, all of the smart card vendors must ensure that the products are 1.8V and 3V phone work. Otherwise, if the smart card manufacturers to provide products that support only 1.8V, there will be hundreds of millions of users problems.
Industry
Mobile phone SIM card will not be damaged due to error
In addition, according to report, relevant reports from the technically absolutely unreasonable. Insiders said that, like digital cameras will not choose a different brand, different grades of SD card is causing the machine is damaged, a cell phone can not be because of the wrong SIM card to cause machine damage, locking, data loss.
According to stakeholders to explain, if the device into a low pressure environment, must be the low-voltage device to fail. Therefore, if the iPhone 4 is 3V power supply, 2GSIM card is a 1.8V power supply, even if the problem is burning SIM card, without damage to the phone itself. In addition, support 1.8V to 3V SIM card than the SIM card only supports a smaller power consumption, so if the words of an impact on battery life, but also increases the battery life, not damage.
Links
Phone while charging while listening to very safe
Voltage on the cell phone has a lot of rumors. For example in a post on the microblogging that one in to charge their cell phones at home, the telephone rang, he answered it will be the outlet. After a few seconds, a strong current through the cell phone, the young man was knocked to the ground. But in fact, only five volt cell phone charging voltage, the voltage value than absolute security even lower. This shows, while charging while listening to calls is very safe.