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The mobile phones may be locked to the providers sim card?<br />
If so a rental prepaid phone is the cheaper option.<br />
If you can detail your visitors country, phone model and providers contract, then further options may be suggested.
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The mobile phones may be locked to the providers sim card?
If so a rental prepaid phone is the cheaper option.
If you can detail your visitors country, phone model and providers contract, then further options may be suggested.

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I have few people coming over from overseas to US that would want to use their phones here. &nbsp;Would that work if I buy them SIM cards with prepaid minutes? &nbsp;Does it work for any GSM phone? &nbsp;And does matter which cards?<br />
Please advice.
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I have few people coming over from overseas to US that would want to use their phones here.  Would that work if I buy them SIM cards with prepaid minutes?  Does it work for any GSM phone?  And does matter which cards?
Please advice.

SIM cards question

A cellular phone (also known as a mobile phone, cell phone, hand phone, or simply a phone) is a telephone that can make and receive telephone calls over a radio link while moving around a wide geographic area by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network. Mobile phones that offer services such as text messaging, email, Internet access, business applications, gaming, photography and more general computing capabilities are referred to as smartphones.

Cell Phones

A smartphone or smart phone is a mobile phone with an advanced mobile operating system that combines features of a personal computer operating system with other features useful for mobile or handheld use. They typically combine the features of a cell phone with those of other popular mobile devices, such as personal digital assistant (PDA), media player and GPS navigation unit. Most smartphones can access the Internet, have a touchscreen user interface, can run third-party apps, music players and are camera phones. Most Smartphones produced from 2012 onwards also have high-speed mobile broadband 4G LTE internet, motion sensors, and mobile payment mechanisms.

Smartphones

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.