not connecting to base

last week my Triumph-LS quit connecting to our local cors base. I assumed the data had been used up so I purchased a new sims data card. The new card will not connect, it attempts to connect then comes back with "socket failure". I purchased a card with "netbook" data 250 MB at $15.00 per month. Do I have the right data? We have connected using WI-FI so it is not in the base. AT&T assigned a pin of 1234. Is this my problem?
help would be appreciated.
Thanks
Dale
 
The AT&T salesperson did not put the 250 mb on the sims. After going back to AT&T and talking to another salesperson they put this on my regular service with a micro sims card listed as a tablet. The data will be charged to my 10GB as shared data, for this I will pay $10.00 per month and don't need to reload the sims as it will continue each month. When I loaded the card it connected ok.

Thanks Dale
 
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