It seems to me that the paqueticos pre-pago are a better deal, if you can live with just calling to the same company mobile numbers. However, you could also just make calls with Whatsupp or Messenger.
For example, Altice you get 7GB for 5 day paqueticos with a bono for calls illimitado to Altice mobile numbers.
Claro is a 5 day with 5GB and Viva has a 7 day one that they claim is illimitado navigation, but I read that after 4GB-they downgrade.
All of these pre-paid plans cost about 700-800 per month, if you add up all the 5 day packets over 30 days.
The post paid planes just don't seem to add up-unless you absolutely need a plan to make calls to various phone numbers-both mobile and landline no matter the company.
I have an Hibrid plan Infinito with 3Gb plus a bonus of 6Gb, after spend my 9 Gb degraded to 384 kbps withc is very good speed and its stable, unlimited calls within VIVA's Network and unlimited SMS, Rollover of the GB not used to the next month, a plus form VIVA is that calls outside network has the same price, 5.52 pesos tax included. The paln mothly fee is 775.00 pesos.
The Hibrid plans works like prepaid services but with some benefices, I can cancell anytime I want, The price per minute on prepaid plans is like 8.00 pesos per minute and my plan is 5.52 pesos.
I always top it with 100.00 pesos for emergency calls aoutside of network, call most of the time with Whatsapp, and to call USA for free using the internet I use Hangouts wich works very very well. So far in the last 2 months I have spend calling outside network 50.00 pesos of my balance.