SIM cards only work in GSM phones. CDMA phones, the other major type of phone, do not have a SIM card slot so are not compatible with SIM card use.
Some phones are carrier locked and will only work with the SIM cards of certain phone companies. Also, micro-SIM and nano-SIM cards have been created that only fit in phones that are designed to be compatible. The main two US cell phone networks that use GSM phones are AT&T and T-Mobile, while CDMA phones are featured on Sprint and Verizon networks. Since these GSM and CDMA phones use completely different technologies, they can only work with service providers that use their respective technology.Learn More
To identify the generation of an iPad, find the model number on the iPad. Match the iPad model number using a model number table. If you do not have access to a model number table, look for identifying characteristics of your iPad.Full Answer >
Block anonymous calls by typing *77 on the keypad of your phone. When this service is activated, callers from anonymous numbers hear a pre-recorded message telling them to release their caller ID information and then call back.Full Answer >
As of 2014, in order to send messages to a mobile from Facebook, a user's mobile carrier must support this feature. After signing in to Facebook, locate Settings at the top right of the page, click Mobile, add the phone number and select the country and mobile carrier.Full Answer >
4G refers to the fourth generation of wireless networks. It is an advanced cellular network that succeeded 3G, or third generation networks, to provide improved mobile broadband Internet access. Current and potential applications include improved mobile web capabilities, gaming services, high-definition mobile video services and cloud computing.Full Answer >