Typically, when some can get AT&T service while others can't, it's because the nodes for the loop are already in use. Each loop can only support so many connections at once, and if there are not enough available, service could be restricted to first-come, first-served or by address. In the meantime, we recommend periodically checking on service availability in case anything changes. If you have any other questions or concerns, let us know!
Aminah, AT&T Community Specialist
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