Buy a disposable phone — If you’re in a country for a while and all you need are calls, texts, and maybe some light web browsing, just buy the cheapest prepaid phone you can find at the local mobile store. Sure, it’ll probably be complete rubbish, but you can often pick these phones up with a bit of credit for next to nothing and they’ll do the job for a while. The upside? You really won’t care if you drop it in the hostel toilet. If it does survive the length of your trip, just pass it onto to somebody else when you leave.
AT&T's size, reputation, and brand recognizability also means they don't have to beat other carriers on price to stay competitive. AT&T's plans are among the most expensive on the market, though a recent overhaul of their unlimited offerings have made them a bit more reasonable. The main things you're paying for with AT&T are coverage, features (like hotspot allotments) and international options. 
Aland Islands (Finland), Austria, Azores, Belgium, Britain, Bulgaria, Canary Islands, Cyprus (South), Czech Republic, Denmark, Eire (Republic of Ireland), England, Estonia, Finland, France, Germany, Great Britain, Greece, Guernsey, Hungary, Ireland (Eire), Ireland (Northern), Isle of Man, Italy, Jersey, Latvia, Lithuania, Luxembourg, Malta, Monaco, Netherlands, Northern Ireland, Poland, Portugal, Romania, Scotland, Sicily, Slovakia, Slovenia, Spain, Sweden, United Kingdom, Vatican City, Wales

The other option is an unlimited-data plan, but these aren’t truly unlimited: All four carriers have carved out restrictions on things like hotspot use and streaming video, while adding premium tiers or for-fee add-ons that lift some of those limits. As a result, shopping for wireless service can look a lot like buying a plane ticket: You can’t jump on the cheapest price you see, lest you wind up in Basic Economy.
Finally, we didn’t factor in taxes and regulatory fees, because they vary by jurisdiction (on my own T-Mobile plan, for example, these fees added up to just under 10 percent of my July 2018 bill). But wherever you live, taxes and fees should hit you equally across all of your options—except for T-Mobile’s T-Mobile One offering, which sweeps them into the advertised cost.
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.
Flexing that unlimited vacation policy and staying abroad for more than a week or two? Consider replacing your SIM card and using a local service provider. First, make sure your phone is unlocked. You can do this by swapping your SIM card for another one and confirming that your phone still works, or simply calling your service provider. The FCC requires that providers unlock all devices so you can use them on any network, so simply ask your provider for an unlock code. One caveat, though: That rule doesn't apply if you're locked into a contract or you haven't paid for your phone in full.
If you travel internationally, Verizon’s TravelPass can seem tempting. That option costs a reasonable $5 a day in Canada and Mexico to use voice, text, and data drawn from your domestic allowance, $10 a day in much of the rest of the world (with a few exceptions, such as Saudi Arabia and Qatar). But Verizon phones are all sold unlocked, so you can (and should) save money by using a local prepaid SIM when traveling internationally.
Activ. Fee: Up to $30/line. Reqs. credit approval and eBill. Included features/content may change or be discontinued at any time. AutoPay: $5/mo. discount may not reflect on 1st bill. Quality of Svc. (QoS): Customers who use more than 50GB of data during a billing cycle will be deprioritized during times & places where the Sprint network is constrained. See sprint.com/networkmanagement for details. Usage Limitations: To improve data experience for the majority of users, throughput may be limited, varied or reduced on the network. Sprint may terminate svc. if off-network roaming usage in a mo. exceeds: (1) 800 min. or a majority of min.; or (2) 100MB or a majority of KB. Prohibited network use rules apply—see sprint.com/termsandconditions.
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