If you’ve got a GSM phone already, call your wireless company and ask to have it unlocked. Once your phone is unlocked you’ll be able to access other mobile carrier networks around the world. Not all phone companies will unlock all types of phones and often your account needs to be in good standing and open for more than 90 days, or your phone must be completely paid for and off-contract.
AT&T, the second-largest carrier, offers a strong GSM network—allowing simultaneous voice and data use even outside LTE territory—and good in-building coverage via its widespread low-band spectrum. But its unlimited-data subscription rates aren’t as attractive, especially for multiple lines—its capped Mobile Share Flex plans will better suit most people’s needs. Buying your phone on AT&T’s installment plan brings an extra risk: Until you’ve paid it off, the device will be locked and stuck with unfavorable international-roaming charges. And though AT&T’s $10 International Day Pass matches Verizon’s pricing, it isn’t available in as many countries (PDF) as Verizon’s option or AT&T’s much more expensive Passport roaming.
The phone can also be charged using a special ‘Dash’ charger. This promises a 63% charge in just 30 minutes, and unlike many other quick chargers, it doesn’t cause the phone to heat up to an alarming level. It does this by moving the majority of the heat management into the charger itself, as opposed to it being within the phone’s hardware. This makes it ideal to use in countries with high temperatures.
We quizzed experts, crunched numbers, and pored over fine print and pricing to help you figure out how much data you need, which network offers the best coverage where you need it, and whether a postpaid or prepaid plan is the best for you. We think that Verizon Wireless’s single-line 5 GB plan is the best cell phone plan for most people, but we have a variety of picks for different needs.

You can also purchase an international SIM card that can be used in many different countries. This is a good bet for multi-country trips or for travelers who travel regularly to many different regions around the world. However, the option of replacing the SIM card is only available on unlocked phones. Ask your phone company if your phone’s SIM card can be unlocked.
Why we love it: T-Mobile's ONE family plan gives you 4 lines of unlimited data, Netflix subscriptions and unlimited hotspot usage (at 3G speeds)—all for $140 a month. Plus, it comes backed by T-Mobile's solid network. If you have a family full of data streamers and browsers, this plan is the way to go. Did I mention that all taxes and fees are included in this price? 

I love this phone. I was looking at the Galaxy 5 but I will not pay that much for a phone and I really hate contracts. I have kept my T-Mobile to go account and this phone is about as perfect as one can be. It's easy to use, fits easily into my pocket, doesn't drop calls, they keys are a good size, I love the features on it. I have the Android apps on it that I love and am no where's near running out of memory even with all the photos and things I have stored in it. The battery gets me through the day with energy to spare and if I get worried it charges pretty quickly.
Verizon’s network is still better than T-Mobile’s, but that advantage is less pronounced for data. Automated drive testing by the research firm RootMetrics that rate T-Mobile poorly include lagging grades for voice and text use, while they show T-Mobile as a respectable third place for speed and data. PCMag currently ranks T-Mobile as a very close second to Verizon, while OpenSignal’s test results say that T-Mobile is now actually ahead of Verizon in speed and data. And though T-Mobile’s GSM-based network—which lets you talk and use data simultaneously, unlike Verizon’s—has historically leaned on higher-frequency bands that don’t reach as far inside buildings, that’s getting better. That GSM foundation also means that T-Mobile is compatible with more phones than Verizon is, including virtually every unlocked phone you can buy.
Sprint Unlimited Plus Plan: $70/mo. for line 1, $50/mo. for line 2 & $30/mo. for lines 3-5 with autopay. Non-Financed Promo: Up to 5 new lines on Unlimited Plus. Pay additional $10/mo/line after Financed device upgrade. Credits applied within 2 bills. Includes unlimited domestic calling, texting, 15GB LTE MHS, VPN & P2P & data. MHS reduced to 3G speeds after 15GB/mo. Third-party content/downloads are add’l charge. Plan not avail. for tablets or MBB devices. Select Int’l svcs are included for phone lines. See sprint.com/globalroaming. Subsidized devices incur an add'l. $25/mo. charge.
24-Mo. Installments: Req. 24-mo. installment agmt, 0% APR & qualifying device & svc. plan. Device pricing for well-qualified customers. Models with higher memory config. may req. a down pymt. Mo. pymt. terms & down pymt. for all others will vary. Down pymt., unfinanced portion & sales tax (on full purch. price) due at purch. Early termination of 24-Mo. Installments/Svc.: If you cancel wireless svc., remaining balance on device becomes due.

Look for more tie-in deals from the carriers that throw in one video service or another, along the lines of T-Mobile’s free Netflix subscription with two-line plans, Sprint’s Hulu deal, AT&T’s WatchTV bundle, and Verizon’s $20 discount on a bundle of unlimited wireless and a triple-play of Fios Internet, phone, and TV service. (These media tie-ins are essentially another way carriers try to keep you around without the handcuffs of two-year contracts. Watch for new-lease or early-upgrade deals, but treat them with a fair amount of skepticism; buying your phone independent of service gives you far more leverage.)

Disclaimer: The information featured in this article is based on our best estimates of pricing, package details, contract stipulations, and service available at the time of writing. All information is subject to change. Pricing will vary based on various factors, including, but not limited to, the customer’s location, package chosen, added features and equipment, the purchaser’s credit score, etc. For the most accurate information, please ask your customer service representative. Clarify all fees and contract details before signing a contract or finalizing your purchase.
However, switching to prepaid, where you pay for service before you use it, can be an easy way to save $10 to $20 a month or more. Many prepaid services are provided by smaller companies that simply resell service from one of the big carriers, so they offer similar coverage as those carriers at a lower price. But for these resellers to undersell the major carriers while using those carrier networks, the resellers make some trade-offs; similarly, the major carriers’ own prepaid plans tend to involve restrictions their postpaid plans lack. We don’t recommend switching to prepaid unless you meet most of these criteria:
Each call is priced at a per minute rate for international toll, plus airtime and applicable charges and taxes.  Rates vary, based on country called.  Per minute rates only available from a customer's local U.S. Cellular home calling area. U.S. Cellular per-minute rates are subject to change.  Taxes, long distance, toll, and other charges may apply.  Other restrictions and limitations may apply.  
If you’ve got a GSM phone already, call your wireless company and ask to have it unlocked. Once your phone is unlocked you’ll be able to access other mobile carrier networks around the world. Not all phone companies will unlock all types of phones and often your account needs to be in good standing and open for more than 90 days, or your phone must be completely paid for and off-contract.

Verizon’s best plan for most people is also its least obvious offering: the 5 GB for $55 deal. It’s difficult to find this plan on Verizon’s homepage, but you should see this option if you select a phone, add it to your cart, and scroll past Verizon’s flagship “unlimited” offerings when selecting a plan. (Verizon’s website quotes a $60 rate for this plan, but signing up for auto-pay using a checking account or debit card gets you $5 off—though this precludes running up points on a travel-rewards credit card).
For each service, we computed the cost of a few typical bundles of smartphone service, setting minimal use at 1 gigabyte (GB) of data, moderate use at 3 GB, and heavy use at 5 GB. (Research firms’ estimates have shown steady increases in average use since the first version of this guide, but usage estimates per carrier have also diverged as some carriers have switched to selling only unlimited-data subscriptions: In the second quarter of 2018, Strategy Analytics found that Android users who had opted into its survey used on average 5.9 GB on T-Mobile, 5 GB on Sprint, 4.5 GB on Verizon, and 3.9 GB on AT&T. However, usage outside of the big four can be lower, to judge from the much lower monthly average reported by the wireless trade group CTIA for 2017: only 1.3 GB.
Verizon is the nation's largest carrier, boasting a staggering 149 million subscribers as of 2017. Pretty impressive for a company that's technically only been around since 2000 (after a merger between GTE Wireless and Bell Atlantic). Verizon was the first to launch a wireless high-speed broadband network, and the first to build a large-scale 4G LTE network. 
If you’re looking to save, don’t miss our holiday deals and everyday deals. A great new smartphone doesn’t have to cost an arm and a leg. Our deals are some of the best available, so you’re sure to find what you need at a price you like. For great gifts at low prices, make sure to check for our holiday deals. We bring hot deals for nearly every holiday on the calendar. And even if it’s not a holiday, we’ll have other discounts that are perfect for birthdays, graduation, and any other special occasion. No matter the reason, we’ll help you save with our cell phones and accessories deals. Make sure to check back often for the latest discounts and holiday wireless deals. Our savings are sure to satisfy any gamer, power user, or enthusiast—or just help you upgrade from a slow, old cell phone to the latest in wireless technology. When you need a smartphone, smartwatch, accessory, or gift that doesn’t break the bank, check here first.

Each call is priced at a per minute rate for international toll, plus airtime and applicable charges and taxes.  Rates vary, based on country called.  Per minute rates only available from a customer's local U.S. Cellular home calling area. U.S. Cellular per-minute rates are subject to change.  Taxes, long distance, toll, and other charges may apply.  Other restrictions and limitations may apply.  
New smartphone releases are generally on the pricey side. If you aren't dying to have the latest device as soon as it comes out, waiting a few months for the price to drop can really pay off. Apple products typically take around a year to decrease in price. Most new Sony, LG and Samsung products become substantially more affordable within three to six months after release. Amazon and eBay usually have good selections of these products, and both frequently offer cell phone promo codes and coupons. If you're a dedicated early adopter, look for presales, which might offer an opportunity to save some cash.
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