Register Sim Card

[telboy1938]

Is it ok to register a sim card in an iPhone and then transfer it to a Huawei WiFi unit?

[Buenchico]

Contrary to the old saying ("Size isn't important") I think that you'd probably face a practical problem. Huawei devices require mini-SIMs:
http://ee.co.uk/help/phones-and-device/huawei/huawei-e5330-mobile-wifi/huawei-e5330-mobile-wifi---getting-started/huawei-e5330-mobile-wifi---what-sim-type-is-required
(They're actually what most people think of as 'normal' SIM cards, 25mm x 15mm)

iPhone 4 and 4s models use micro-SD cards (15mm x 12mm)

iPhone 5 and later models use nano-SD cards (12.3mm x 8mm)

[telboy1938]

Hi Buenchico. Would it be ok to use a phone that uses same sim as Huawei to register it? Thanks.

[Buenchico]

I suspect that Huawei devices are locked to a particular network. So if, say, you bought this device
https://www.pcworld.co.uk/gbuk/phones-broadband-and-sat-nav/broadband/mobile-broadband/three-pay-as-you-go-3g-mifi-10023991-pdt.html
you'd need to use a Three SIM. So, to try what you're suggesting, you'd obviously need to use either an unlocked phone or a phone locked to Three for the registration process.

However, depending upon how the provider's system works, you might then end up with a 'data+calls+texts' account (for the phone), rather than the 'data only' type that you'd actually need (for the wifi device).