A former Telstra worker will spend the next 12 months in prison after being convicted of stealing more than $100,000 worth of mobile phones and selling them on eBay.

Ellen Falkenberg, 24, was a manager at the Alice Springs Telstra shop, where she falsified records in order to steal mobile phones and sell them online between 2013 and 2015.

Earlier this month, she pleaded guilty to selling 188 new and used mobile phones worth about $107,000 through her then-boyfriend's eBay account and linked to her own PayPal account.

She used the telco's courier service to send the phones to buyers around Australia.

In sentencing, Justice Jenny Blokland told the Supreme Court Falkenberg showed a "high level of deceit in a trusted position".

On the evening she was questioned by police, Falkenberg changed her eBay account to the name of a fellow Telstra employee who had reported a false sale to the company, the court was told.

"Her attempt to cover her tracks made matters worse. [Falkenberg's crimes] must have taken some thought and planning," Justice Blockland said.

She added it was an "elaborate system" Falkenberg set up, "but it was inevitable that the thefts would be revealed".

Justice Blokland noted Falkenberg's family grief, moderate depression, thyroid issues and a difficult relationship with her former boyfriend in considering her sentence.

Crown prosecutor Glen Dooley had argued Falkenberg's offending was a case of greed, not need, and she did it in order to maintain a lifestyle.

Falkenberg received a suspended sentence of three years. She will serve the next 12 months in jail.

The court heard Telstra was not seeking compensation.