RotaryCell项目成功改造了传统旋转拨盘电话，使其能够通过LTE蜂窝网络正常工作1。该项目基于ESP32-S3微控制器和A7670蜂窝调制解调器实现，核心硬件包括LilyGO T-A7670G-S3开发板、Silvertel AG1171用户线路接口以及单节受保护的21700电池1。改造方案充分尊重了原始电话的设计，内部电子元件采用可逆安装方式，无需对原电话进行任何永久性改动1。
手工制作的原型已验证可正常工作，当前固件版本为v0.10.41。该系统支持旋转脉冲拨号、来去电、机械铃声、北美拨号音、双向握手柄音频、电池监控、USB诊断、Wi-Fi维护界面以及OTA远程更新等功能1。项目团队已于2026年8月下单制作首批集成PCB电路板：音频和重置A4 PCB于8月27日从JLCPCB下单，AG1171运营商通孔PCB于8月28日下单，待后续组装验证1。
The RotaryCell project has successfully adapted a vintage rotary telephone to operate over modern LTE cellular networks while preserving all of its original mechanical components and appearance 1. The system is built around an ESP32-S3 microcontroller paired with an A7670 cellular modem, with internal electronics mounted reversibly to avoid permanent modifications to the phone 1.
The prototype, which has already undergone functional testing, supports rotary pulse dialing, incoming and outgoing calls, mechanical bell ringing, North American dial tone, bidirectional handset audio with proper handshaking, battery monitoring, USB diagnostics, a Wi-Fi maintenance interface, and over-the-air updates 1. The core hardware consists of a LilyGO T-A7670G-S3 development board for power management and cellular connectivity, a Silvertel AG1171 subscriber line interface, and a single protected 21700 battery cell 1. The firmware version in testing is v0.10.4 1.
Production has commenced with custom PCB designs ordered from JLCPCB; the audio and reset A4 PCB was ordered on August 27, 2026, followed by the AG1171 subscriber line interface PCB on August 28, 2026, with both awaiting assembly and verification 1.
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