Refurbished Samsung Galaxy Z Flip4 256GB F721U Blue Unlocked Smartphone - Excellent Refurbished.

A: Hi, thank you for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished. Yes, the Samsung Galaxy Z Flip4 (Model SM-F721U) is highly compatible with Verizon. As a "U" model (carrier-version hardware), it is specifically designed to work on CDMA/LTE networks like Verizon and is generally unlocked or optimized for their network. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

A: Hi, thanks for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished. Got it — this is a very common issue on refurbished Galaxy Z Flip4 phones with Cricket (especially eSIM), and it’s usually fixable. I’ll walk you through this step‑by‑step, starting with the most likely causes. ✅ What your symptoms mean You can make or receive calls, but the other person can’t hear you This almost always points to one (or more) of the following: VoLTE / HD Voice not properly provisioned on Cricket APN or IMS registration problem Refurbished device firmware mismatch (carrier model vs unlocked software) Faulty mic path being used (secondary mic / noise‑cancel mic issue) Because you’re using Cricket eSIM on a refurbished F721U, #1 and #3 are the most common. Step 1: Make sure VoLTE is ON (critical for Cricket) Cricket requires VoLTE for calls. If VoLTE isn’t fully working, calls may connect but audio won’t pass. Check this: Settings Connections Mobile networks Turn ON: VoLTE calls (If present) HD Voice 👉 If VoLTE is missing or greyed out, that is a BIG clue. ✅ After toggling, restart the phone and test a call. Step 2: Disable Wi‑Fi Calling (temporarily) Wi‑Fi Calling misconfigurations often cause one‑way audio. Settings Connections Wi‑Fi Calling Turn it OFF Restart Make a test call using cellular only If audio works now → Wi‑Fi Calling was the problem. Step 3: Reset network settings (safe, does not erase phone) This fixes most APN / IMS registration problems. Settings General management Reset Reset network settings Confirm Restart phone ⚠️ This will delete Wi‑Fi passwords & Bluetooth pairings, but not your data. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

A: Hi, thanks for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished. Yes, this phone is fully compatible with T-Mobile. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

A: Hi, thank you for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished. Yes, the Refurbished Samsung Galaxy Z Flip4 256GB F721U typically comes with a box, but it is usually a generic white or brown box rather than the original manufacturer packaging. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

A: Hi, thanks for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished. Yes, the Samsung Galaxy Z Flip4 (Model F721U) is generally compatible with Boost Mobile, but there are a few important details to keep in mind to ensure a smooth setup. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

A: Hi, thanks for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished Yes, you can still update the OS on a Samsung Galaxy Z Flip4 in 2026, but it is nearing the end of its "major" update journey. Because this is a Refurbished model, the first thing you should do upon receiving it is go to Settings > Software update > Download and install to catch up the updates to the phone. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

A: Hi, thanks for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished. Yes, the Samsung Galaxy Z Flip4 (F721U) is eSIM compatible and works with Mint Mobile's eSIM service. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

A: Hi, thank you for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished. The Samsung Galaxy Z Flip 4 SM-F721U (Unlocked) supports extensive 5G/4G LTE bands, including common European/UK frequencies (Bands 1, 3, 7, 8, 20, 28) and global GSM/UMTS, making it suitable for international travel. It works with local SIMs in Europe/Ireland. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

A: Hi, thanks for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished. Yes, this Samsung Galaxy Z Flip4 (Model F721U) will work with AT&T. Since the listing specifically states it is "Unlocked," it can accept an AT&T SIM card even if it was originally manufactured for a different carrier (like Verizon or T-Mobile). If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.

A: Hi, thank you for reaching out about Refurbished: Samsung Galaxy Z Flip4 256GB F721U Unlocked Smartphone - Seller Refurbished. Yes, the Refurbished Samsung Galaxy Z Flip4 256GB (SM-F721U) Unlocked Smartphone will work with Tracfone. If you have any additional questions, we welcome you to contact MyTGTtech at 833-848-8324 every day, between 7am-11pm CST.