Unlock your device
The other key is that your phone must be "unlocked" from your current carrier before it can be activated with a new provider. The lock is a software code that's put on the phone by the manufacturer per the requirement of the carrier that sells the device. The lock is meant to ensure that the phone can't be used on any other operator's network until a different software code is entered to unlock the device.
If you have a device that is locked, you can get it unlocked from your wireless carrier if you meet certain criteria, like paying the full price of your device or ending your contract and being in good standing with your current provider. If you meet these requirements, having your device unlocked can usually be done simply by making a call to your carrier's customer service department and requesting it.
Make the switch
Once you've confirmed that your new provider's network is compatible with your phone, and that your phone is unlocked, switching is simple. You'll get a SIM card from your new carrier and insert it into the proper slot on your device. The process will vary depending on the type of device you have. SIM cards come in three different sizes (nano, micro and standard) and the location of the SIM slot is not uniform, though most are located on the side of your phone.
Carriers today make it easy to switch. Consumer Cellular, for instance, provides the SIM card and activation on their networks for free when you sign up using a compatible GSM phone. In addition, they offer no-contract monthly plans which include talk, text and data for as low as $20 a month.
If you're using a cellphone that still works great for you, there's no reason to take on the expense of a new device. Instead, find a carrier that fits your tastes, needs and budget. If your phone is compatible with their networks, a new SIM card will deliver everything you need to keep your phone and improve your service.
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"The process will vary depending on the type of device you have. SIM cards come in three different sizes ...."
"The lock is a software code that's put on the phone by the manufacturer ...."