Will this function as a WiFi extender / repeater on an existing network without an installed sim card?

Yes, it will. I used it at my house briefly in that capacity until I could get my Plume adaptive WiFi set up and installed, and it worked fine. It's not the fastest in the world, but it was functional.

ASIN	B011YM0QC4
Antenna Location	Laptop, Tablet
Antenna Type	Fixed
Best Sellers Rank	#32,902 in Computers ( See Top 100 in Computers ) #15 in Modems
Brand	HUAWEI
Built-In Media	1x E5577Cs-321, 1x Battery, 1x USB Charging cable, 1x Quick Start
Color	White
Compatible Devices	Smartphone
Compatible devices	Smartphone
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	App
Controller Type	Switch
Coverage	Wide Network Decor
Customer Reviews	4.2 out of 5 stars 8,117 Reviews
Data Transfer Rate	150 Megabits Per Second
Frequency	2.4 GHz
Frequency Band Class	Dual-Band
Frequency band class	Dual-Band
Global Trade Identification Number	06901443063420
Is Modem Compatible	Yes
Item Dimensions L x W x H	9.5L x 5.5W x 1H centimeters
Item Weight	0.12 Kilograms
LAN Port Bandwidth	150 Mbps
Manufacturer	Huawei
Maximum Upstream Data Transfer Rate	50 Megabits Per Second
Mfr Part Number	E5577C
Model Name	E5577-320
Model Number	E5577-320
Model name	E5577-320
Number of Antennas	2
Number of Ports	1
Operating System	RouterOS
Other Special Features of the Product	WPS
Security Protocol	WPS
Special features	WPS
Unit Count	1 Count
Wireless Compability	802.11ac
Wireless communication standard	802.11ac

Huawei E5577-4G Low-Cost, Super-Fast Portable Mobile Wi-Fi Hotspot –(Genuine UK Warranty Stock)-White

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