Do Not Contact panel showing calls allowed from contacts.

Block Calls on Your Smartphone

Cell phones are a fantastic convenience, but they come with unexpected surprises like unwanted phone calls. Maybe your cell phone number was recycled or your number appeared in some directory for a business. Regardless of the cause, solutions are popping up ranging from downloadable apps and 3rd party services that can help manage the experience.
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example of SIM card

Benefits of SIM Cards

If you're a cell phone user whose carrier uses the GSM standard such as T-Mobile, AT&T, Vodafone and others, your phone includes a tiny electronic card that offers a lot of value. The card is called a SIM (Subscriber Identity Module) card and it can maintain your preferences. Just as important, this removable smart card can secure your data, which makes it much easier to move from one phone carrier to another.
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