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If your Casio F-B100W will not pair, reconnect, or transfer step data, start with charge, watch mode, phone Bluetooth, app permissions, and distance. If those checks fail, remove the watch’s pairing records from the watch, CASIO WATCHES app, and phone Bluetooth settings, then pair again. Use the F-B100W operation guide for the watch-side deletion steps: Casio’s procedure varies by model.
What the F-B100W connects to your phone to do
The F-B100W connects to a phone over Bluetooth through the CASIO WATCHES app. Casio says the connection supports automatic time correction, configuring watch functions in the app, and transferring tracked data such as step counts for viewing on the phone. Casio does not establish a specific sync interval or a dedicated manual-sync button in the guidance cited here, so do not assume data transfers instantly or continuously. Consult the F-B100W operation guide for model-specific operating details. Casio’s F-B100W product page describes its connected functions.
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Why won’t my Casio F-B100W pair with my phone?
First make sure the watch and phone are ready to pair. Initial setup uses CASIO WATCHES, a CASIO ID registration or login, registration of the watch in the app, and the permissions requested for your phone. If the phone displays an operating-system pairing request, accept it. After successful pairing, the watch should connect without repeating the full pairing process each time. Casio’s CASIO WATCHES App Connection Start Guide gives setup instructions and illustrates phone settings that Casio says were accurate as of September 2025; menu labels can vary by phone and OS.
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- Install or open CASIO WATCHES and sign in or register a CASIO ID.
- Register the F-B100W in the app and follow the on-screen pairing prompts.
- Grant the permissions the app requests, then accept a phone Bluetooth pairing prompt if one appears.
Check permissions on the phone
Casio’s current connection guidance says location permission is required for Bluetooth connection and says this does not track or identify your location. For iPhone, its instructions include location access and Precise Location. For Android, they include location, nearby devices on Android 12 and later, and allowing background or battery use where those options are available. Permission names and paths differ by OS and device, so follow the app’s prompts and your phone’s current settings rather than relying on a menu path that may not match your version. See Casio’s setup guide.
#1 Best Overall
- Micro Light, Hourly Time Signal, Auto Calendar
- 12/24 Hour Formats
- Dial Code: Digital
- Water Resistant
- Daily Alarm
Why won’t the watch reconnect?
Work through these low-impact checks before deleting pairing records. Casio recommends a charged watch, Timekeeping Mode, and disabling airplane mode if the model has it. A running stopwatch or timer can also prevent connection. On the phone, turn airplane mode off, check that Bluetooth is enabled, and toggle Bluetooth off and back on. Restart the phone if needed. Casio’s general connection troubleshooting guide also recommends bringing the phone within about two meters of the watch and moving away from nearby Wi-Fi devices and household appliances that could interfere. That distance is a troubleshooting recommendation, not a guaranteed Bluetooth range.
- Confirm the watch has sufficient battery and is in Timekeeping Mode.
- Stop any active stopwatch or timer.
- Turn off airplane mode on the watch, if available, and on the phone.
- Confirm phone Bluetooth is on; toggle it off and on if the watch remains disconnected.
- Keep the phone close to the watch and move away from nearby wireless devices or household appliances.
- Check that CASIO WATCHES has the required permissions and can run in the background where your phone provides that setting.
- Restart the phone if the connection still does not return.
For the exact current phone and OS compatibility matrix, check Casio’s current app or support information; the sources cited here do not verify a complete compatibility list.
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- ICONIC VINTAGE DESIGN A true Casio classic, the A168WA-1 combines timeless retro styling with dependable digital functionality. Its polished stainless steel bracelet and signature square case create an iconic look that's perfect for everyday wear, business casual, or vintage-inspired fashion.
- BRIGHT ELECTRO-LUMINESCENT BACKLIGHT Unlike standard LED illumination, the A168 features Casio's Electro-Luminescent (EL) backlight, providing a bright, even blue-green glow across the entire display for outstanding nighttime visibility.
- PRACTICAL EVERYDAY FEATURES Stay on schedule with a 1/100-second stopwatch, daily alarm, hourly time signal, auto calendar, and selectable 12/24-hour time format. Designed for reliable everyday performance whether you're at work, school, or on the go.
- LIGHTWEIGHT COMFORT & LONG BATTERY LIFE Weighing just 50 grams with an adjustable stainless steel bracelet, the A168WA-1 is comfortable enough for all-day wear. Its dependable CR2016 battery provides approximately seven years of operation under normal use.
- DEPENDABLE CASIO QUALITY Built with Casio's legendary reliability, this watch features quartz accuracy of approximately ±30 seconds per month, water resistance for daily use, a durable chrome-plated resin case, and a stainless steel bracelet designed to withstand years of everyday wear.
How to reset Bluetooth pairing and pair again
If the basic checks do not help, clear the saved pairing information from all three places where it may be stored: the watch, CASIO WATCHES, and the phone’s Bluetooth device list. This removes pairing records, so use it after the simpler checks.
- In CASIO WATCHES, remove the F-B100W’s pairing or registration as directed by the app.
- In the phone’s Bluetooth settings, forget or delete the F-B100W entry if it appears there.
- On the watch, delete its pairing information using the F-B100W operation guide’s model-specific instructions.
- Start pairing again from CASIO WATCHES, follow the watch-operation prompts, and wait for setup to complete. Accept the phone’s Bluetooth pairing request if prompted.
- If the first pairing attempt fails, retry it after confirming the previous pairing records have been cleared.
Do not copy a button sequence from another Casio watch. Casio explicitly directs users to the specific watch manual’s “Deleting the Watch’s Pairing Information” or “Troubleshooting” section because watch-side operations vary by model. The exact F-B100W button sequence is not established in the general connection guide. Find the F-B100W operation guide through Casio’s F-B100W support page.
Rank #3
- EASY READER — LARGE TIME DIGITS FOR INSTANT READABILITY — Designed as an Easy Reader with large time digits and an LED backlight, the W-217H prioritizes one thing above all else — the ability to read the time quickly and effortlessly at a glance. Bold utilitarian colors and high-visibility dial design deliver an easy read in any lighting condition, making this an ideal everyday watch for anyone who values clarity over complexity.
- LED BACKLIGHT FOR LOW-LIGHT VISIBILITY — The amber-colored LED backlight ensures visibility in low-light conditions, allowing you to read the time even in the dark. Activates instantly at the press of a button — simple, practical, and battery-friendly for everyday use from early mornings to late nights.
- 1/100-SECOND STOPWATCH WITH SPLIT TIME — The 1/100-second stopwatch covers elapsed time, split time, and 1st-2nd place timing up to 59'59.99" — precise enough for sports, fitness routines, cooking, and any activity where accurate timing counts. Operated simply with the side-mounted buttons, no complicated setup required.
- DAILY ALARM | HOURLY TIME SIGNAL | AUTO-CALENDAR — Features a daily alarm, hourly time signal, and full auto-calendar with selectable 12/24-hour format, accurate to ±30 seconds per month. The display shows hour, minute, second, PM indicator, date, and day at all times — everything you need, nothing you don't.
- 7-YEAR BATTERY | 50M WATER RESISTANT | SLIM LIGHTWEIGHT BUILD — The square resin case measures 43.1 × 41.2 × 10.5mm and weighs 32 grams, powered by a CR2016 battery with an approximate 7-year life. Water resistant for everyday use, bathing, and swimming in shallow depths — a capable, low-maintenance companion for daily life. Available in Black, Blue, Green/Beige, and Gold-Dial colorways.
What to do when you change phones or the watch was repaired
Pairing with a new phone
Casio says a new phone requires pairing again. Prevent the old phone from connecting, remove the watch’s pairing information using the F-B100W guide, install CASIO WATCHES on the new phone, and pair the watch there.
After watch repair or replacement
If the watch was repaired or replaced and no longer connects, Casio recommends deleting the pairing information and pairing again. Follow the F-B100W-specific manual steps for the watch-side deletion rather than assuming the replacement or repaired watch uses the same procedure as another model.
Rank #4
- Band Size: Mens-Standard
If pairing still fails
If the official checks and a careful re-pair do not restore the connection, contact Casio through the repair or inquiry options listed on its F-B100W support page.
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Best Value
- Water Resistant, LED light
- Stopwatch, Daily alarm, Hourly time signal
- Calendar, 12/24-hour format
- Approx. battery life: 7 years on CR2016
- Case diameter: 30.0 millimeters
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