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Any gsm dialler will do, Best to get a cheapmonthly sim with unlimited txt , most don't remember to top up or when your system goesad it send lots of txt and uses up credit anyway

I am not sure that signing could be enforced therefore it cannot be a compliance requirement, you cant tell someone that they must sign something otherwise their system is not compliant, all you can do is request a signature, and if refused, write refused to sign. Signing is useful though we had an old lady with alzheimer's who refused to pay for her service saying we had not been, but she couldn't argue with her signature.