| Siemens SL42 | HTC J Butterfly HTL21 |
| Manufacture | Siemens | HTC |
| Model | SL42 | J Butterfly HTL21 |
| Form factor | Block | Block |
| Weight | 88 gram | 140.00 |
| Dimensions (HxWxD) | 105 x 42 x 17 | 143.00 x 71.00 x 9.10 |
| Operating System | Other | Android |
| Networks | 2G - 900/1800 | 3G - CDMA2000 1xEV-DO |
| HSCSD |  | |
| GPRS | | |
| EDGE | | |
| UMTS | | |
| HSDPA | | |
| HSPA+ | | |
| WiMAX | | |
| LTE (4G light) | |  |
| WLAN / Wi-Fi | | |
| Wi-Fi Hotspot | | |
| Wi-Fi Direct | | |
| SMS | | |
| MMS | | |
| | |
| HDMI out | | |
| USB port | | |
| MHL | | |
| Bluetooth | | |
| Bluetooth version | NA | 4.0 |
| DLNA | | |
| GPS | | |
| Glonass | | |
| ANT+ | | |
| IrDA | | |
| NFC | | |
| 3.5 mm audio connector | | |
| Camera | | |
| Camera resolution | NA | 8 megapixel |
| Image Stabilization | | |
| BSI sensor | | |
| Camera Flash/Light | | |
| Flash type | NA | LED |
| Video recording | | |
| Video capture resolution | NA | 1080p |
| Second Camera | NA | 2.1 megapixel |
| Display size | 1.5 inches | 5.00 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | NA | 16777216 |
| Display width | 101 | 1080 |
| Display height | 46 | 1920 |
| PPI | 73.99 | 440.58 |
| Second Display | NA | NA |
| CPU | NA | 1.5 GHz quad-core, Qualcomm Snapdragon S4 APQ8064 - MDM9615 |
| GPU | NA | NA |
| Memory | NA | 2 GB RAM. 16 GB internal storage |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | 42 | MP3, AAC, AAC+, eAAC+, WMA, WAV |
| Java | | |
| Games | NA | Yes, downloadable |
| FM Radio | | |
| Battery | Li-Ion 540 mAh | 2020 |
| Standby time (h) | 170 | NA |
| Talktime (m) | 240 | NA |
| Wireless Charging | | |
| Browser | 1.1 | Android HTML Webkit |
| Calendar | | |
| Voicedialing | | |
| IP Code | NA | IPX5 |
| Predictive text | | |
| RSS reader | | |
| Voicememo | | |
| PC Synchronization | | |
| SyncML | | |
| Website | Website | Website |