You can get
Bolivia cell phone rental for weekly rental basis, friend of mine has rented Motorola V180 from Planet Omni for $59.95/3 weeks, the rental package includes hand-held GSM phone, re-chargeable battery, dual-voltage charger, International plug adapters and some instructions.
Bolivia has many cell phone rental companies and Cellhire, All Cell & World Cellular rentals are some of the reliable Bolivia cell phone rental companies. But whenever you get a cell phone rental in Bolivia, you will also need to buy a SIM card and it's an easy way to make international calls, hope this helps & have a nice time in Bolivia :)