Free tools

Free Wireless Tools

Everything Best Cellular has built, in one place. Made for retail counters, repair shops and wireless dealers — and free for everyone else too.

Managed by M. Curtis McCoy · Last reviewed September 21, 2026 · How we make money

Every tool on this page is free, works on a phone at a counter, and needs no signup, no login and nothing installed. They run in your browser. Nothing you type is stored or sent anywhere.

Working tools

Port-outTransfer PIN and account number lookupType the carrier the customer is leaving. Get the account number, the transfer PIN and the phone number to call on one screen, for 230 US carriers. Share a direct link to any carrier.Open the lookupCoverageCoverage map by carrierNearly every brand rents one of three networks. Type a carrier and find out which one, then open that network’s official map and check your own address against the FCC’s independent map.Check a carrierDatabaseCarrier and network databaseAll 230 US carriers with the network each one runs on, plus the porting instructions for every brand. 54 on Verizon, 34 on T-Mobile, 24 on AT&T, 30 on more than one, 7 on their own towers.Browse all 230Device swapWill this phone work on my line?Validate an IMEI, find out whether a phone still works on US networks after the 3G shutdowns, and get a straight answer on whether swapping the device will change the plan. Text, email or print the answer.Check a phone

Reference tables

Not interactive, but they answer the questions that come up at a counter every day.

APNAccess point name settingsWhat an APN is, when a phone needs one set by hand, and the settings for each network type.Open the APN tablesSIMSIM cards and eSIMsWhich SIM a phone takes, what eSIM changes, and why a physical swap is not always possible any more.Read the guideSizesSIM card sizesStandard, micro, nano and embedded, with the dimensions and what fits what.See the sizesActivationHow to activate a phoneThe activation path for each network, and what to have ready before you start.Read the guide

Older tools we are rebuilding

These still work, but they were built for a different era and are being rewritten. Their URLs are not changing.

DataMobile data calculatorWork out how much data you actually use, so you stop paying for a tier you never touch — or stop running out three weeks in. Being rebuilt around real usage patterns.Open the calculatorUICCUICC SIM card lookupThe tool that put Best Cellular on the counter at Best Buy stores nationwide. Built for Sprint, which no longer exists. Kept online while we decide what replaces it.Open the lookup

In development

Two tools we are building next, both because dealers keep asking for them. No dates — they ship when the underlying data is verified, not before.

  • IMEI compatibility checker. Enter an IMEI, find out which US networks the device will actually work on and which bands it supports. Every dealer and every customer has needed this since IMEIs existed, and no free version is any good.
  • Device swap checker. Answers one question: will putting a different phone on my line change my plan? People stall on an upgrade for months because nobody will give them a straight answer, and a wrong guess can cost a grandfathered plan permanently.

Use these in your store

No permission needed and no licence to sign. Bookmark them, link to them from your own site, put them on the tablet at the counter, print them, text the link to a customer. If it helps you close a switch faster, use it.

Both the port-out lookup and the coverage tool put the carrier in the web address, so you can send a customer straight to their own answer instead of telling them where to click.

Transfer PIN lookup · Coverage by carrier · All 230 carriers

Need a tool that is not here?

If you work a counter and there is a question you answer over and over with no good reference to point at, tell us what it is. That is where every tool on this page came from.

Tell us what you need

Some links on this site are affiliate links, and Best Cellular may earn a commission at no extra cost to you. Best Cellular is a research and reference site. It is not a wireless carrier and does not sell wireless service.