Mobile broad broadband poor coneeotio

[Chalkychap]

Sometimes that's caused by a network fault or service issue.

Check for this online at https://www.three.co.uk/support/network_and_coverage/network_support, using the location's postcode.

[MSF]

Follow up on what @Chalkychap suggests, but also bear in mind that it may be linked to the building you are in, or even a geographical issue e.g. in the dip of a valley. Try it in various areas around you to see if it is the same.