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Hi

My M7350 v4 with the latest f/w on will only connect to the t-mobile network at 2G/GSM speeds. It has a SIM from Three in the UK installed with roaming enabled on the M7350 and enabled by Three.

When I first arrived in the US it showed t-mobile as the carrier and 4G as the signal but always showed "connecting" in the app. Checking the support site I could see this was an issue fixed by a f/w update and so updated the unit. Now it connects and shows "Three" as the carrier but will only connect at 2G/GSM speeds. I've spoken with Three support who cannot see any configuration issues with the SIM . There is no restriction on their end and they have records of it connecting at 2G speeds. They say there is no restriction on their agreement with t-mobile as the roaming carrier.

The t-mobile 4G and 3G radio bands are compatible with the M7350. If I force it to use 3G only or 4G only it will not connect at all.

I've tried downgrading the f/w back to the past two versions and both have the same issue (although v171110 show t-mobile as the carrier, not Three) I've restored it back to v180119 for now.

APN settings are correct according to Three (and i've tried both "three.co.uk" and "3internet" as APN names as well as fast.t-mobile.com. All of them will only connect at 2G.

A factory reset has not fixed it either.

Anybody else seen this and maybe got a fix?

Thanks